色漆和清漆 “可溶性”金属含量的测定 第7部分:色漆颜料和水溶色漆中的汞含量的测定 火焰原子吸收光谱法

[中文适用范围]： 其原理在于，从涂料的颜料部分获得的测试溶液中所含的汞化合物被氧化，或者在封闭系统中用氧气燃烧从水稀释涂料的液体部分获得的测试溶液的蒸发残留物。 。 将汞(II)化合物还原为单质汞。 通过冷蒸气（无焰）原子吸收光谱法在 253.7 nm 范围内的波长测定单原子蒸气形式的汞。 该方法适用于“可溶性”汞含量在约0.005％(m/m)至0.05％(m/m)范围内的涂料。 [外文原描述]： The principle consists in oxidation of the of hte mercury compounds contained in the test solution obtained from the pigment portion of the paint or combustion with oxygen in an enclosed system of the evaporation residue of the test solution obtained from the liquid portion of water-dilutable paints. Reduction of the mercury(II) compounds to elementary mercury. Determination of the mercury, as the monoatomic vapour, by cold vapour (flameless) atomic absorption spectrometry at a wavelength in the region of 253,7 nm. The method is applicable to coating materials having "soluble" mercury contents in the range of about 0,005 % (m/m) to 0,05 % (m/m).