火焰原子吸收光谱法测定高纯碳酸钡中锶

FAAS Determination of Strontium in High-purity Barium Carbonate

摘要: 在火焰原子吸收光谱法测定高纯碳酸钡中痕量锶的方法中,试验了在样品溶液中分别加入不同比例的6种有机试剂以提高方法的灵敏度.结果表明:在试样溶液中加入甲酸达到体积分数为85%时,其增感度提高达70%,为与其他5种试剂(甲醇、乙醇、正丙醇、甲醛及乙酸)相比较而言的最高值.对甲酸-水(85+15)溶液体系中,火焰原子吸收光谱法测定锶标准加入法测得的回收率在100%~106%之间,测定值的相对标准偏差(n=6)为2.2%.

Abstract: In the FAAS determination of strontium in high-purity barium carbonate,sensitization effects of 6 organic reagent were tested when added to the aqueous sample solution with different mixing ratios.It was found that formic acid,when added to a volumic ratio of 85%,showed highest sensitizing effect (ca.70%) as compared with the other 5 reagents (i.e.,methanol,ethanol,n-propanol,formaldehyde and acetic acid).Recovery and precision of the method using the formic acid-H2O (85+15) solution system,were tested by addition of standard Sr solution (i.e.,1.9 mg·g-1) for 6 determinations,giving values of recovery ranged from 100% to 106% and value of RSD (n=6) obtained was 2.2%.