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How do you sample low level mercury?

For low-level testing in water, mercury is analyzed using cold vapor atomic fluorescence spectrometry. Ultra-clean sampling techniques (Method 1669) and laboratory analysis under clean room conditions are used to ensure the lowest achievable detection limits and avoid common causes of sample contamination.

Where is mercury in the nations streams?

Fish methylmercury concentrations in streams typically were highest in wetland- dominated landscapes, particularly in coastal plain streams of the Southeastern United States. Fish methylmercury levels also were high in the Western United States, but only in streams that historically had been mined for mercury or gold.