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In testing the water with test kits we sometimes find that their upper test limits are lower than what our water samples contain. In other words, our samples' results are above the maximum limit of the test. The solution is to dilute the sample, and then convert the readings by the dilution level to get the proper values. Be sure to dilute your sample with distilled water (obviously this won't work for oxygen tests). It's always a good idea to test the distilled water for the group being tested for, just to make sure there will not be any interference. For instance, if the distilled water tests positive for any of the groups it is not really distilled water, and you need to find a better source for it. Let's say we want to test a 10% solution of our sample. We would mix 1 cc (ml) of our sample with 9 cc's of distilled water. We would then fill the test container with the 10% solution. After the test we would multiply the result by 10 to get the correct value. Or we might want to work with a 20% solution, so we would mix 2 cc'c of the sample with 8 cc's of distilled water. We would then multiply the result by 5 to get the correct value. For a 50% solution we would mix 5 cc's of our sample with 5 cc's of distilled water, and then multiply the result by 2. Happy testing! |
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