【摘要】 本文叙述了呼吸性粉尘的采样方法和在同一呼吸性粉尘样品中测定游离二氧化矽及铁、镁、铜、铅的分析规程。采样是使用BDX44型个体采样器和BDX99R呼吸性粉尘采样头;样品经磷酸加热处理,使矽酸盐矿物和金属溶解,经过滤分离出游离二氧化矽残渣,滤液用来测定金属。残渣用氢氟酸溶解,然后在铜酸盐溶液中形成矽钼酸盐化合物,这个溶液用来测定矽。矽和金属的分析使用原子吸收光谱法。游离二氧化矽的检测限是4.5μg,变异系数是8.2％。并报告了一些作业场所的测定结果。更多还原

【Abstract】 A Complete description of the method for sampling respirable dust from ambient air and analytical proeedure is given with reference to free silica, Fe, Mg, Cu and Pb, in the same sample. Sampling is accomplished by BDX44 Super Sampler and BDX99R Respirable Dust Sampling Head. The silicate minersls and metals are dissolved by heating the sample with phosphoric acid. Free silica residue is separated by filtration. The filtrat is used for determining metals. The residue is dissolved with hydrofluoric acid and then a silicomolyb-date complex is formed in a malybdate solution. The solution is used for determining silicon. All the analyses are done by flameless AAS.The detection limit is 4.5ug, the coefficient of variation is 8.2% for free silica. Results are reported from some different workplaces.更多还原