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The water from a school drinking fountain was tested in late August and was found to contain an unacceptable concentration of lead. However, the water was tested again, after the students returned to school in September, and was found to be under the maximum allowable concentration. Suggest a possible explanation for this difference. Assume that the school was unused over the summer and that none of the pipes were replaced.

The water only dissolves the lead-containing materials very slowly, so if water sat idle in the pipes all summer, or even several days, it would have had a chance to dissolve lead from solder (lead/tin) and brass plumbing parts (many brass alloys contain a few % lead to aid machining). Once the school is occupied, the water would be being used regularly, so it would not sit in the pipes very long, thus there would be less time for lead to disolve into the water and the measured concentration would be lower.

2008-01-08 06:05:03 by Jada

This video is a Fox 5 News cast featuring my brother discussing lead in drinking water. For more information, visit www.qualitywatersystems.net.

I haved moved into a Victorian House (in the UK) with the original main. I tend to give my children bottled rather than tap water. How can I test?

Thanks in advance

Try going to your local pharmacy and see if they have a test kit.

2007-06-14 00:02:28 by harry w

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Works with the following models: General Electric GQSL55F, General Electric GXSL55F
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I drink water from the tap sometimes unintentionally. Recently, I drank water that didn't taste that good, but it was a very small amount. Although it's unlikely in this day in age, I was wondering if the drinking water might have lead in it. If so, are there any symptoms that one can encounter a few days after consumption. Thank you.

I think you can buy test strips to test for harmful chemicals in your water. Try looking at Wal-Mart or a hardware store.

2007-08-13 17:36:30 by Garrett

Price: $28.74 $14.95

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The water from a school drinking fountain was tested in late August and was found to contain an unacceptable concentration of lead. However, the water was tested again, after the students returned to school in September, and was found to be under the maximum allowable concentration. Suggest a possible explanation. Assume the school was unused over the summer and none of the pipes were replaced.
This question is worth 3 marks. I was kind of thinking maby the water was not being used over the summer and when the children came back to school, all the lead got flushed out when the water was running again. Could this be correct? Any ideas? I don't think this answer would get me 3 marks though.

Expanding on your idea. The pipes possibly close to the resevoir had lead or led fitting. The water was stagnant over the summer and absorbed a larger amount of lead then when the water was flushed out and not stagnant for as long of a period of time. Suggesting the water source is fine but the school has problems with its system.

2007-04-30 13:42:59 by flowers4eden

Old building, possibly has lead pipes.

LOOK UP WHAT SALT PRECIPITATE CAN BE FORMED WITH Pb - almost all salt of Pb ARE INSOLUBLE. JUST USE CuCl OR SOME OTHER SALT THAT HAS METAL LESS REACTIVE THAN Pb

2009-01-28 08:59:06 by zl1422