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本文采用大面积的银丝沾汞膜电极,100mvs~-线性电压扫描速率,三电极系统,记录导数波,在NH_4Cl-HCl 底液中,通氦,搅拌条件下,于-100mv 富集60S,用标准加入外推法,先测出底液空白值,然后加入一定量水样,再在相同条件下测出总镉量,扣除底液空白值与测定空白值时的加标总量,测定了水样中1PPb 以下痕量镉,检出限为0. 2PPb。方法灵敏快速,结果满意,为条件一般的实验室进行痕量成分分析提供了有实用价值的测试方法。
In this paper, a large area silver mercury film electrode, 100mvs ~ - linear voltage scanning rate, three-electrode system, the recorded derivative wave in the NH_4Cl-HCl bottom solution, through helium, stirring conditions, Standard addition of extrapolation method, the first measured liquid blank value, and then add a certain amount of water samples, and then measured the total cadmium under the same conditions, minus the blank liquid blank value and the determination of blank value when the total amount of spike determination 2PPb. The following water samples in 1PPb trace cadmium, detection limit of 0. 2PPb. The method is sensitive and rapid, and the results are satisfactory. It provides a practical test method for the trace component analysis in the general laboratory.