Effect Of UV Rays On Pool Chlorine Biology Essay

Effect Of UV Rays On Pool Chlorine Biology Essay Pools have always been a source of leisure for Australians. They provide enjoyment and good times for many households generated in a family or local swimming pool. Despite this, pools have to be maintained by using chemicals or disinfectants, lest unwanted pathogens create health hazards. However, the over use of these chemicals can also result in health hazards such as; serious irritation and breathing problems. A balance or equilibrium, therefore, must be achieved to maintain suitable conditions. This is where chemistry comes into play. The main type of chemicals used in pools to prevent unwanted pathogens is pool chlorine. Sodium hypochlorite is a commonly used as pool chlorine. It was discovered by Louis Pasteur in the late 19th century that sodium hypochlorite had disinfectant properties. Sodium hypochlorite effectively kills bacteria, viruses and fungi. When pool chlorine is added to water, a reaction takes place where hypochlorus acid is formed. In the past, most consumer chlorine bleach was sold in a 5.25% solution. Today, some more concentrated solutions are being sold and touted as an improvement over the less concentrated bleaches. To check for the concentration of the pool chlorine, excess potassium iodide is to be added to it and then it is to be titrated with a solution of sodium thiosulfate. The concentration of the liquid chlorine is then to be calculated using stoichiometry. The net ionic equations of the chemical reactions are: Source: Chemistry In use Book 2 There are also many factors that affect the effectiveness of pool chlorine such as sun radiation. Ultra-violet (UV) light degrades hypochlorous acid to hydrochloric acid (HCl). Ultraviolet (UV) radiation not only destroys light sensitive chemicals such as sodium hypochlorite (NaOCl), it also has the potential to significantly degrade the structural integrity of the storage tank or IBC containing the light sensitive material.   According to the NSW  Ministry of Health  (2010) roughly 1/3 of free chlorine exposed to UV lights in a outdoor swimming pool is destroyed every hour. UV light therefore lowers the concentration of the disinfection component of free chlorine. In this experiment, the concentration of sodium hypochlorite in pool chlorine, left under a UV lamps for different periods of times, was measured. Aim: To investigate the effects of Ultra Violet (UV) rays on sodium hypochlorite (a bleaching agent used commonly in pools). 2.0 Hypothesis: As pool chlorine is left for longer periods of time under UV rays, the concentration of the pool chlorine will decrease. This was hypothesised as the theory suggests that UV rays degrade the component in pool chlorine which allows it to disinfect bacteria. 3.0 Equipment/Material Material Diluted Sodium hypochlorite Sodium thiosulfate Potassium iodide Starch indicator Boiling water Equipment 2 x 100 mL Beaker 5 x 250 mL Beaker 15 x 100 mL Flask 2 x 1L Volumetric flask 1 x 500 mL Volumetric flask 1 x 100mL Measuring cylinder 2 x 20mL Measuring cylinder 3 x Funnel 5 x 20 mL Pipette 2 x 1mL Pipette 3 x Stirring rod Senior Balance Burette and stand UV Lamp Permanent marker Stopwatch 4.0 Safety To prevent any harm to the group during this experiment, safety precautions were taken to ensure the safety of the members. Refer to Appendix A for MSDS (Material Safety Data Sheet). Lots of glassware was used Refrain from holding too many pieces of glassware at once. Clean up glass immediately if any is broken. Handle boiling water with care Boiling water was used to create a solution of starch. Beaker tongs were used to carry the boiling water. Potassium iodide is irritating to eyes and skin Avoid contacting without gloves. Wash with water if contact occurs. Sodium thiosulfate is irritating to eyes and skin Avoid contacting without gloves. Wash with water if contact occurs. Starch gives skin discomfort Avoid contacting without gloves. 5.0 Procedure Refer to Appendix 1 for preparation of solutions Preparation of titration A burette and stand was filtered with the sodium thiosulfate solution. The burette was filled up with the sodium thiosulfate solution to around the 0mL mark. 100mL of diluted sodium hypochlorite was poured into 5 individual 250mL beakers. These beakers were labelled 0min, 15m, 30m, 1hr, 3hrs and 4hrs. All the beakers, except the 0min beaker, were placed under the UV lamp for the amounts of time labelled on them. At this point the stopwatch was started, once the samples had reach the specified time they were taken out. For each time sample, 20mL was measured with a pipette and placed into 3 100mL flasks. 10mL of potassium iodide solution and 2mL of starch indicator solution were prepared prior to every titration. Titration The mark of where the sodium thiosulfate solution in the burette was recorded before the titration occurred. 10mL of potassium iodide solution was added to each time sample of 20mL sodium hypochlorite solution in the 100mL flasks. The new solution was left until it has completed reacted (when the solution turns light yellow). The solution was then titrated until it turned a very pale yellow. 2mL of starch indicator solution was added to the titrating solution. This should make the solution a dark blue/black colour. Titration continued at a slower rate until the solution had turned clear. Record the finishing titre mark on the burette. These steps were repeated 3 times for each time sample (total of 18 titrations). Figure 1: Diagram of titration in progress. 6.0 Results Table 1: Table showing the amount of sodium thiosulfate solution added to sodium hypochlorite and potassium iodide solution at different times left under the UV ray. Refer to Appendix 2 for initial volume and final volume calculations and averages. Time (mins) Volume (mL) Average of 3 titrations 0 23.35 15 22.95 30 22.51 60 18.35 180 16.03 240 12.70 Table 2: Table showing the concentration of pool chlorine Refer to appendix 3 for converting of average volume of titration to concentration. Amount of time left under UV lamp (mins) Concentration of OCl (M) 0 0.03250 15 0.03198 30 0.03131 60 0.02558 180 0.02234 240 0.01770 Figure 1: Graph showing the concentrations of pool chlorine left under a UV lamp for different periods of time. 7.0 Discussion An experiment design was made to test and compare the effects of UV rays on pool environments, particularly on the impacts of chlorine concentration. In doing this, a total of 18 pool chlorine samples were put under a UV lamp for different periods of time. The concentrations of the chlorine when left untouched by UV rays were stable at around 0.03M. By exposing the pool chlorine samples to ultraviolet lights for given periods of time, the concentration of the chlorine decreased. The graph shows that as the sodium hypochlorite is more exposed to UV rays, the lower concentration of the pool chlorine was. A line of best fit was drawn to display the trend in the data. It showed that there is a linear relationship between the concentration and time left under a UV lamp. The data collected agrees with the theory that UV rays disrupt the structural integrity of the pool chlorine. The photodecomposition of chlorine is apparent as the initial levels of hypochlorite ion decreased by a signific ant amount when exposed to sunlight. The photochemical reaction that represents the situation of the experiment is: The main errors of the experiment were the inaccuracies of most aspects dealt with when implementing the experiment. One anomaly occurred when one sample of chlorine was left under the UV lamp for 60minutes. There is a major drop in concentration from 30min. This suggests that there was experimental error during the investigation. 8.0 Conclusion The results collected from this experiment suggest that the more pool chlorine is subject to UV lights, the lower the concentration of the chlorine will be. It has partially supported the hypothesis Bibliography Deb Smith, D. R. (2006). Chemistry in use Book 2. Sydney: Queensland Chemistry syllabus. Date retrieved: 05/09/12 Fletcher, D. J. (N/D). (The Sodium Hypochlorite Story). Retrieved September 5, 2012, from south shore gunite pools: http://www.southshoregunitepools.com/resources/htms/naocl.htm Gina A. Ishida, B. à ·. (N/D). IMPACT OF CHLORINE AND MONOCHLORAMINE ON ULTRAVIOLET. University of North Carolina, Chapel Hill, NC: N/A. Date retrieved: 05/09/12 N/A. (N/D, N/D N/D). Chlorination of pool water. Retrieved September 6, 2012, from pested: http://www.pested.msu.edu/resources/bulletins/pdf/2621/e2621chap7.pdf N/A. (1968). Stabiliser (Cyanurate) Use in Outdoor Swimming Pools. Retrieved September 5, 2012, from NSW Government Health: http://www.health.nsw.gov.au/utilities/copyright.asp Appendices Appendix A Going to add MSDS later†¦ Appendix 1 Diluting sodium hypochlorite 100mL of sodium hypochlorite was measured and put into a 1000mL volumetric flask. The flask was filled with distilled water up to the 1L mark The flask was inverted several times Sodium thiosulfate solution 8.82g of sodium thiosulfate was placed into a 1L volumetric flash The flask was filled with distilled water up to the 1L mark The flask was inverted several times Potassium iodide solution 5g of potassium iodide was weighed and placed into a 250mL beaker Distilled water was poured until it reached 105g on the scale The solution was thoroughly mixed Starch solution 1g of starch indicator was weighed and placed into a 250mL beaker 100mL of water was boiled and placed into the 250mL beaker The solution was thoroughly mixed and was left to cool down All solutions were labelled with the name of the solution, the concentration, a group members name and the teachers name. Appendix 2 Initial volume and final volume of sodium thiosulfate left under a UV lamp at different periods of time. 0 min 23.35-0.04 15 min 45.63-23.29 30min 22.34-0.07 = 23.31mL =22.34mL =22.27mL 46.76-23.31 23.04-0.14 44.78-22.32 = 23.45mL =22.90mL =22.46mL 23.54-0.13 46.66-23.04 23.01-0.21 =23.29mL =23.62mL =22.80mL Avg = = = =23.35mL =22.95mL =22.51mL 60 min 41.22-23.01 3 hour 15.62-1.23 4hours 13.23-0.12 =18.21mL =14.39mL =13.11mL 18.62-0.33 30.59-15.62 26.35-13.23 =18.29mL =14.97mL =13.12mL 37.26-18.72 49.32-30.59 38.21-26.35 =18.54mL =18.73mL =11.86mL Avg = = =18.35mL =16.03mL =12.70mL

Environmental Impacts of Airport Operations

Lutehr’s article focuses on the importance of understanding the environmental impacts of airport operations at both local and international level.According to Lutehr, only by having senior airport management develop such understanding would help in improving environmental quality and relations with airport neighborhood and stakeholders. Lutehr further argues that Airport management should ensure that various stakeholder groups are involved in matters pertaining to airport pollution and therefore agree on ways of pollution control.The most important stakeholder groups include airport neighborhoods that get affected by pollution and airlines whose activities lead to the pollution itself. Lutehr states water quality, noise, and air as the main forms of pollution emitted from airports and should therefore receive special and utmost attention.The author has improved his arguments through in depth research. For instance, he has borrowed heavily from EPA (Environmental Protection Age ncy) regulations concerning pollution. Luther has supported his arguments at two levels. The first one regards what should be done during the planning (construction and expansion) session and during the actual airport operation period.I completely agree with Lutehr’s arguments considering the impact of airport pollution. Most importantly, Lutehr has pointed the importance of brainstorming of possible pollution even before airports are constructed or expansion projects are undertaken. In other words, feasibility studies of pollution should be undertaken when airport construction and expansion plans are underway.This would ensure inclusion of pollution control plans in airport operations. As a stakeholder in airport pollution, I find myself well convinced by Lutehr’s arguments, especially considering the wide body of knowledge that supported his assertions. The author has indeed done a good job of convincing readers.ReferencesLutehr, L. (2007). Environmental Impacts of A irport Operations, Maintenance, and Expansion. Retrieved July 10, 2009, from http://www.fas.org/sgp/crs/misc/RL33949.pdf.Wayne, L. (2009). Airport Projects Delayed or Canceled. Retrieved July 10, 2009, from http://www.nytimes.com/2009/06/23/business/23airports.html?_r=4&src=twt&twt=nytimestravel&pagewanted=print

Many newspapers and magazines feature stories about the private lives

Many newspapers and magazines feature stories about the private lives of famous people. We know what they eat,where they buy their clothes and who they love. We also often see pictures of them in private situations. Is it appropriate for a magazine or newspaper to give this kind of private information about people? Give reasons for your answers. Everybody is interested to read the newspaper daily and also they used to read weekly or monthly magazine. Most of the people without fail used to read newspaper .People intention to read news paper to know about current affair and future development but the news paper and magazine are giving celebrities and famous person’ personal life instead of giving relevant news. In my opinion people hate this kind of inappropriate news. The news paper and magazine are publishing others personal life because of business. in fact people is not interested to know about others life. some people is interested to read about sports,science,business and politics.Moreover news paper and magazine should find relevant news for our society then only people like to read the news paper otherwise the ratio of buying newspaper will declined over period of time. The news reporter s are always seeing the news about celebrities personal life or their personal picture, which is not help our society, it may impact their business in their future. in addition the celebrities and famous people should not allow their personal life and should not discuss with media because it is not useful for people.Instead of going personal life,Reporters will collect the information like† How there are achieved their life and what is the secret of success† so this kind of things will help for our society. To sum up, The news paper and magazine should give good article, find out new information, which will help them to enhance the people knowledge and also the business will grow up. As far as my concern, may be people look at the news paper for others privacy but not interested to read anyone.

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Facebook s Influence On Social Media - 1035 Words

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Basic Argument for Fatalism free essay sample

The â€Å"Basic† Argument for Theological Fatalism Fatalism Fatalism is the view that everything that happens in entirely unavoidable. Since everything that happens is unavoidable, none of our actions are genuinely up to us and we powerless to do anything other than what we actually do. Here is Richard Taylor on what the fatalist believes [â€Å"Fate† from Metaphysics, 4th Ed (Pearson, 1991)]: â€Å"A fatalist is someone who believes that whatever happens is and always was unavoidable. He thinks it is not up to him what will happen a thousand years hence, next year, tomorrow, or the very next moment. † (52) â€Å"A fatalist thinks of the future in the way we all think of the past, for everyone is a fatalist as he looks back on things. † (52) We all think of the past â€Å"as something settled and fixed, to be taken for what it is. We are never in the least tempted to try to modify it. It is not in the least up to us what happened last year, yesterday, or even a moment ago, any more than are the motions of the heaves or the political developments in Tibet. We say of past things that they are no longer within our power. The fatalist says they never were. † (52-53) Theological Fatalism According to the main versions of Western Monotheism (e. g. traditional Christianity), God is omniscient. To be omniscient is to have (in some important sense) unlimited knowledge. It’s hard to say what this amounts to, but let’s use the following definition (since it’s common) x is omniscient = for x knows every true proposition and x does not believe any false propositions. Many people think that omniscience is incompatible with human freedom, because it implies the doctrine of theological fatalism. Theological fatalism is the view that all human actions are unavoidable (and we are powerless to do anything other than what we actually do) because God has exhaustive foreknowledge of all future human actions. Here is an important statement of the argument for theological fatalism from Augustine (On Free Choice of the Will, Book III) I very much wonder how God can have foreknowledge of everything in the future, and yet we do not sin by necessity. It would be an irreligious and completely insane attack on God’s foreknowledge to say that something could happen otherwise than as God foreknew †¦ Since God foreknew that [Adam] was going to sin, his sin necessarily had to happen. How, then, is the will free when such inescapable necessity is found in it? Surely this is the problem †¦ How is it that these two propositions are not contradictory and inconsistent: (1) God has foreknowledge of everything in the future; and (2) We sin by the will, not by necessity? For, you say, if God foreknows that someone is going to sin, then it is necessary that he sin. But if it is necessary, the will has no choice about whether to sin; there is an inescapable and fixed necessity. And so you fear that this argument forces us into one of two positions: either we draw the heretical conclusion that God does not foreknow everything in the future; or, if we cannot accept this conclusion, we must admit that sin happens by necessity and not by will. The Basic Argument for Theological Fatalism Where S stands for any person whatsoever and A stands for any action, Augustine’s argument can be stated as: 1. For any person, S, and an action, A, that S performs, God knew in advance that S will do A. 2. If God knows in advance that S will do A, then it necessary that S will do A. 3. Therefore, it is necessary that S will do A. 4. If it is necessary that S will do A, then S is not free to refrain from performing A. 5. If S is not free to refrain from performing A, then S does not freely perform A. 6. Therefore, no person ever acts freely. Evaluating the argument Premise 2 is ambiguous †¢P2a: Necessarily, If God knows in advance that S will perform A, then S will perform A (De Dicto) †¢P2b: If God knows in advance that S will perform A, then necessarily S will perform A (De Re) P2a is true but the resulting argument is invalid P2a is true. It says that the proposition â€Å"if God knows in advance that S will perform A, then S will perform A† is necessarily true and this just means that it is impossible for God to know in advance that, for example, I will raise my arm at some time and I fail to raise my arm at that time. We can put this by saying that God’s knowing in advance that I will raise my arm at some time logically entails that I will raise my arm at that time. P2a is a way of expressing this truth. The resulting argument is invalid. Using P2a as the key premise, the argument is: 1. Necessarily, if God knows in advance that S will perform A, then S will perform A. 2. God knows in advance that S will perform A. 3. Therefore, necessarily, S will perform A. But this argument is invalid (the conclusion doesn’t follow from the premises). We can show this by means of a counterexample (an argument of the same form with true premises and a false conclusion). The form of this argument is: 1. Necessarily, If p, then p. 2. P 3. Therefore, necessarily q. To see that the argument is invalid, use the following substitutions: p = K. Sharpe weighs over 200lbs, q = K. Sharpe weighs over 199lbs. . Necessarily, If K. Sharpe weighs over 200lbs, then K. Sharpe weighs over 199lbs. 2. K. Sharpe weighs over 200lbs 3. Therefore, necessarily K. Sharpe weighs over 199lbs. The premises of this argument are true but the conclusion is obviously false (I could go on a diet and successfully lose some weight). I weigh over 199lbs but not essentially. I could weigh less than 199lbs and, i n fact, I did weigh less than 199lbs at one point. All that follows from the first two premises is that, in fact, I in fact weight more than 199lbs. It doesn’t follow that it is impossible for me to weigh less than 199lbs. Just in case you are not convinced, here is a second counterexample (Plantinga’s) 1. Necessarily, if I know that George Clooney is a bachelor, then George Clooney is a bachelor. 2. I know that George Clooney is a bachelor. 3. Therefore, it is necessarily true that George Clooney is a bachelor Again, the premises are true but the conclusion is false. George Clooney is a bachelor but he is not essentially a bachelor. He could get married, he just chooses not to. All that follows from the first two premises is that George Clooney is in fact a bachelor (not that he is essentially a bachelor). P2b renders the argument valid but it is obviously false 1. If God knows in advance that S will perform A, then necessarily S will perform A. 2. God knows in advance that S will perform A. 3. Therefore, necessarily S will perform A. This argument is valid (it’s just modus ponens) and so if the premises were true then conclusion would be true as well. But P2b is false. Given the de re reading of P2b, it says that whatever propositions God knows are necessarily true or, to put the point in terms of properties, if God knows that some object has a property then the object has that property essentially. Taken in this way, P2b is obviously false (nor does it follow from omniscience). Since the basic argument has to rely on either P2a or P2b, the argument is either invalid or relies on a false premise. Either way it’s unsound. Here is a way of thinking about this criticism of the argument. From the fact that God knows that Paul will mow his yard on July 7, 2015 it follows that, on July 7 2015, Paul mows his yard and that he does not refrain from mowing his yard on that day. But, it does not follow that it is metaphysically impossible for Paul to refrain from mowing his yard that day (that Paul does not refrain from mowing and it is impossible that Paul refrain from mowing are two very different things). All that follows from the fact that God knows in advance that Paul will mow is that Paul will not exercise his power to refrain not that he lacks the power the power to refrain. The basic argument for theological fatalism needs the later inference, but that inference is not a good one. Thus, the basic argument fails.