火焰原子吸收光谱法测定钛白粉中微量铅

FAAS Determination of Trace Amount of Lead in Titanium White

钛白粉试样用氢氟酸溶解蒸至近干。驱除氢氟酸后用硝酸(1+1)溶解盐类,稀释至一定体积后用空气-乙炔火焰原子吸收光谱法测定其中痕量铅。用氘灯扣背景,消除基体背景吸收干扰,于217.0 nm波长处测定铅,检出限(3σ)为0.03 mg·L^(-1)。在4个不同浓度水平上做回收试验,所得回收率为95.5%～107.5%。对一已知含量(15.0μg·g^(-1))的试样,测定8次,求得其相对标准偏差为3.56。

Sample of titanium white was dissolved in HF, and after evaporation to near dryness, the salts were taken up with HNO3 （1＋1） and diluted to a definite volume. Trace amount of lead in the sample solution was determined by FAAS with air-C2H2 flame and at the wavelength of 217. 0 nm. Deuterium lamp background correction was applied to eliminate the interference of matrix-background absorptioru Detection limit （3a） found for the method was 0. 03 mg·L^-1. Recovery test was made at 4 different concentration levels, giving values of recovery in the range of 95.5%-107. 5%. Test for precision was made with a sample containing 15. 0 μg·g^-1 of lead for 8 determinations, value of RSD found was 3.56%.