提出了亚甲蓝法测定微量硫化物新的显色过程,研究了用普通分光光度法和全差示分光光度法测定微量硫化物的条件.采用普通光度法,标准曲线为A=1.28ρ+0.002,r=0.999 5,表观摩尔吸收系数为4.06×104L/(mol@cm),线性范围为0～0.9mg/L;采用全差示分光光度法,标准曲线为A=7.0ρ+0.004,r=0.999 6,表观摩尔吸收系数为2.2 × 105 L/(mol@cm),线性范围为0～0.14mg/L.与原亚甲蓝法相比,灵敏度显著提高,显色反应迅速完成.两种方法的检测限均为1.0ng/ml;测定100ng/ml S2-,相对标准偏差为1.9%(n=10).实验了各种干扰离子对硫化物测定的影响,提出了消除干扰离子的方法.利用该方法测定环境样品中微量硫化物,结果令人满意.
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