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铬酸钡比色法(简称原法)是测定饮水中硫酸盐的一种常用方法,该法虽然所用试剂的种类较少,但在操作过程中由于二次加热使方法非常繁琐,且重现性较差。据教材介绍,硫酸钡的临界饱和值最大(临界饱和值为1000),只要控制试样和沉淀剂不太浓,常温即可得到硫酸钡的晶状沉淀。据此特点,经多次实验证实,减少二次加热煮沸,简化了操作程序,实验结果较满意,现报告如下: 1 材料和方法 1.1 仪器和试剂 721分光光度计;2.5mol/L盐酸;1十1氨水;铬酸钡悬浮液;硫酸盐标准液(1.00ml
Barium chromate colorimetric method (referred to as the original method) is a common method for the determination of sulfate in drinking water, although the type of reagents used in this method is less, but in the process of operation due to the second heating method is very cumbersome and reproduce Poor sex. According to the introduction of teaching materials, the critical saturation value of barium sulfate is the maximum (the critical saturation value is 1000). As long as the control sample and the precipitating agent are not too thick, the crystalline precipitates of barium sulfate can be obtained at room temperature. According to this feature, after many experiments confirmed that the reduction of secondary heating boiling, simplifying the operating procedures, the experimental results are more satisfactory, are as follows: 1 Materials and methods 1.1 Instruments and reagents 721 spectrophotometer; 2.5mol / L hydrochloric acid; 1 Ten ammonia water; barium chromate suspension; sulfate standard solution (1.00ml