10g轻质隔墙板试样溶于8 mol·L-1硝酸溶液100 mL中,于此溶液中定量加入相当于氯离子估计量(物质的量)1.2倍的硝酸银溶液使其中氯离子定量生成AgCl沉淀。经陈化后,将混合物滤入于200 mL容量瓶中,加水定容。分取此溶液一份,用水稀释200倍后,用电感耦合等离子体原子发射光谱法(ICP-AES)测定其中镁、钙及银的含量。所得银的量为定量生成AgCl沉淀后留存的过量硝酸银溶液。按此银的测定值间接换算成试样中氯的含量。从上述定容为200 mL溶液中,另分取一份溶液加水稀释5倍后,按ICP-AES法测定其中痕量铝、铁及锰的含量。按所提出的方法测定了实样中镁、钙、氯及铝、铁、锰的含量,测定值的相对标准偏差(n=6)均小于2%。

Ten grams of the sample were dissolved in 100 mL of 8 mol·L-1 HNO3. A definite amount of AgNO3 solution, 1.2 times as much as the equivalent amount (amount of substance) of Cl--ion estimated in the sample solution was added to form AgCl precipitate quantitatively. After aging, the mixture was filtered, and the filtrate was diluted to 200 mL in a volumetric flask. An aliquot of the solution was diluted 200 times, and macroamounts of Mg2+, Ca2+ and Ag+ ion (i.e. the excess of AgNO3 solution remained in the filtrate) were determined by ICP-AES. Amounts of chloride ion in the solution were calculated indirectly from the analytical results of Ag+-ion present in the solution. Another aliquot was taken from the filtrate in the volumetric flask and diluted 5 times, in which traces of Al(Ⅲ), Fe(Ⅲ) and Mn2+ were determined by ICP-AES. The proposed method was used in the determination of Mg2+, Ca2+, Cl- and Al(Ⅲ), Fe(Ⅲ), Mn2+ in a substantial sample, values of RSD′s (n=6) found were all less than 2%.