摘要

Approximately 2700 - 6000 tons of mercury are released into the atm osphere every year. Once airborne, mercury can travel thousand of m iles from its generation point. Eventually, it precipitates onto th e land and water. And once it enters water, mercury is transformed by microorganisms into methylmercury, the most toxic and dangerous form of mercury. Methylmercury bioaccumulates most notably in fis h, increasing in concentration as it moves up the food chain. Nearly all fish contain trace amounts mercury, with certain fish co ntaining more than others. Once on the diner table, it creates a we ll researched danger to developing fetuses and young children. Rapi d and accurate testing is vital for public health.

摘要

Mercury determination in biological samples has traditionally been difficult due to the foaming properties of the sample matrix. Digestions with minimal amounts of protein will form a non-wetting, soap-like mixture, which creates a foam when gas is bubbled through it. The patented design of the M-6000A gas liquid separator (GLS) eliminates this problem.

摘要

摘要：本文对32种不同样品（主要是食品如谷类、奶粉及鱼类等）进行了汞含量的分析测定。本文采用的仪器是由意大利Milestone公司生产的DMA80固液相自动测汞仪。这种仪器不需任何样品消解，即无论固体样品还是液体样品均可在253.65nm处用原子吸收法进行测定。该仪器通常的工作范围是0~2mg/kg，也可以测定0~0.2mg/kg的样品。该测试的准确性可从对标准物质的测定结果上看出，精度可参考不同样品的测定结果。经计算，检测限为0.5μg/kg。 关键词：痕量汞、固体样品、AAS