硫酸钡分光光度比浊法是大批量测定环境样品含量的常用方法,但影响测定结果的因素较多,如样品量的多少、稳定剂的选择、酸度的控制、BaCl2的形态和用量(影响沉淀的均匀度)等均可对测定结果产生影响.针对这些影响因素,本文作者优化了HNO3消化——BaSO4比浊法测定高硫样品的实验条件和实验步骤,并对红树林区沉积物及植物样品进行了测定,得到较好的结果.实验证明,称取0.100 0~0.200 0 g样品,以甘油-乙醇为稳定剂,使用10%BaCl2溶液作沉淀剂,在测定前以19 kHz超声波振荡待测液10 min可以达到更好的测定效果.Spectroscopic barium turbidity(SBT) is commonly used in determining the content of sulfur in ervironmental samples,but many factors such as content of samples,choice of stabilizer,control of acidity,form and content of BaCl2 and etc.can affect the results.This paper tries to improve conditions and procedure of the lab operation by spectroscopic barium turbidity method for high-sulfur samples.Sulfur contents of sediments and plants from mangrove were determined with the improved method,quite good result was gotten.In detail,the method is that glycerine-ethylalcohol was used as stabilizer,with BaCl2·H2O solid instead by 10% BaCl2 solution and then,a 10 min ultrasonic wave vibration.国家自然科学基金(40676064,30530150)资
