在硫酸-二苯羟乙酸-二苯胍-氯酸钾体系中痕量钨和钼的催化极谱连续测定

SUCCESSIVE CATALYTIC POLAROGRAPHIC DETERMINATION OF TRACE TUNGSTEN AND MOLYBDENUM IN THE SYSTEM OF SULFURIC ACID-BENZILIC ACID-DIPHENYLQUANIDINEPOTASSIUM CHLORATE

在0.24mol/L硫酸-1.05×10^(-4)mol/L二苯羟乙酸-1.6×10^(-3)％二苯胍-0.13mol/L氯酸钾底液中,钨和钼有一灵敏的平行催化波。可用于痕量钨和钼的连续测定。线性范围为0.001—0.020μg/mL及0.0004—0.020μg/mL。方法准确性好,简便、快速。应用于地质试样、山泉水、自来水的测定,结果令人满意。

A new catalytic polarographic system for successive determination of W and Mo has been presented, The best constituent of a solution of 0.24M H_2SO_4-1.05×10^(-4)M benzilic acid-1.6×10^(-3)％ phenylquanidine-0.13M KClO_3 is selected as supporting electrolyte. The calibration curve for W and Mo are linear in the respective range of 0.001—0.020 μg/mL WO_3 and 0.0004—0.0200 μg/mL MO. This method is simple, rapid and accurate, and has been applied to dermine trace amount of W and Mo in geological samples,tap water and spring water.