使用对乙酰基偶氮胂,在pH=2.2的盐酸——醋酸钠介质中,与铈组元素反应显色时,文献的条件不能掩蔽大于40μg的钛。而土壤待测液中的钛含量一般在100μg左右。当加入500—600mg的柠檬酸时,则能很好地掩蔽含量高达180μg的钛。配合EDTA(0.02M)—锌(0.002M)时,还能较好地掩蔽钇,而对镧和铈的吸光度影响甚微。故试液不经萃取分离即可直接测定土壤中的微量铈组元素。 The literature conditions can not mask greater than 40 μg of titanium with p-acetylarsenazo, in a hydrochloric acid-sodium acetate pH = 2.2 medium, when reacted with a cerium group element. The soil test solution of titanium content is generally about 100μg. When 500-600 mg of citric acid is added, titanium up to 180 μg can be well masked. With EDTA (0.02M) - zinc (0.002M), but also better masking yttrium, and the absorbance of lanthanum and cerium little effect. Therefore, the test solution can be directly measured without separation of trace elements in the soil cerium group.