Take a coffee filter and place crushed meth inside and make a teabag, Then dip in and out of acetone 10 x, let dry.
The purity of the lake water is questionable.You can tell the purity of your tap water by purchasing a home water testing kit.
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The easiest way to test the purity of gold is to use a kit with a touchstone, acids, and test needles of varying purities. You rub a needle of known purity onto the touchstone leaving a gold line, then do the same with your unknown item. You then use the acid corresponding to the test needle you used, and watch to see if both gold scratches turn the same color. A much simpler and more expensive method involves measuring the differing resistance of different purities of gold. A fire assay can very accurately measure the purity of gold, but this is generally available only to a few labs and professionals as it's complicated and expensive.
A test kit
There is different kinds of field test kits.
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ppm stands for "parts per million" and it is the amount of one substance in another substance. You would test for it using a test kit appropriate for whatever chemical level you are trying to determine, such as a chlorine test kit or a calcium hardness test kit.
If you mean to test the water in your aquarium, you need a liquid test kit. We typically use a master kit which can test water for ammonia, nitrite, nitrate, and PH. API Master kit is what we use most often.
There is different kinds of field test kits.
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