摘要
在稀盐酸介质中定量加入铬酸钡悬浮液使与SO2-4反应生成BaSO4沉淀。经煮沸,并调节溶液的酸度后,将含有沉淀的溶液以1500r·min-1的速率离心1min,在420nm波长处用1cm吸收皿,以水作参比测定上层澄清液中CrO2-4的吸光度。硫酸根浓度在0～6mg/50ml范围内符合比耳定律。检出限为0.48μg·ml-1,RSD(n=8)为5.38%(SO2-40.50mg)和1.03%(SO2-42 00mg)。平均回收率为99.5%,方法已应用于雨水、地面水及废水中硫酸根的测定。
Sulfate ion in the sample solution was precipitated as BaSO_4 by a definite amount of barium chromate suspension. After boiling and adjusting the acidity with ammonia water (1+2), the solution mixture is centrifuged for 1min at the rate of 1500 revolutions per minute. The absorbance of CrO^(2-)_4 in the supernatant layer was taken at 420nm with 1cm absorption cell. Beer′s law holds in the range of 0～6mg of SO^(2-)_4 ion per 50ml of solution. The detection limit of the method is found to be 0.48μg·ml^(-1). RSD′s ( n =8) obtained is 5.38% for 0.50mg of SO^(2-)_4 and 1.03% for 2.00mg of sulfate ion. Average recovery is 99.5%. This method has been applied to the analysis of raining water, ground water and waste water.
出处
《理化检验（化学分册）》
CAS
CSCD
北大核心
2003年第12期711-712,共2页
Physical Testing and Chemical Analysis(Part B:Chemical Analysis)
关键词
间接光度法
测定
水
废水
硫酸根
沉淀法
硫酸钡
铬酸钡悬浮液
Precipitation
Barium sulfate
Barium chromate suspension
Indirect-photometry
Sulfate ion
Water samples
