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What are they?
Why test for them?
Nitrates potentially can interfere with the blood's ability to carry oxygen in humans and other animals.
In cattle it may cause shortness of breath, and the blood will look brown instead of red. Nitrate poisoning may cause cattle to froth at the mouth, suffer convulsions, appear blue around the muzzle and have a bluish tint around the eyes. Moderate poisoning is thought to cause poor growth, infertility, abortions and vitamin A deficiencies.
Where do they come from?
How can we prevent them from entering our surface waters?
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