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alcohol suppresses the amount of ADH (anti-diahretic hormone) released, causing less water being reabsorbed from urine to blood in kidneys. you will then produce a lot of dilute urine as a result >> To measure the alcohol concentration in their urine I would test the concentration of the urine, to test how much water there was in the urine. Normally, 95% of the urine is composed of water, but if the person had drunk alcohol, the kidneys would take out more water (from the blood) than usual and pass it into the urine. This would have a diluting effect on the urine, so more of the urine would be composed of water than normal. I could test for water by dipping dry cobalt chloride paper into the urine. I could then note any colour change. A pale pink would indicate water, and I could compare the colour of the paper to the other urine samples.

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16y ago

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