用BaCl_2滴定法快速测定硫酸盐的研究

Use the Vitriolic Research of Fast Measurement of Method of BaCl_2 Titration

用铬酸钡光度法、EDTA滴定法、间接原子吸收法、离子色谱法等方法测定SO_4^(2-)检测上限都很低(12-200mg/L),且只适用于清洁水,若水样混浊则会引起较大的误差。有的地下水,SO_4^(2-)浓度高达44000mg/L,用BaCl_2滴定法测定SO_4^(2-)：测试水样,以溴酚蓝做酸碱指示剂,加1：50盐酸,调为pH=3．5,加入30ml异丙醇,以钍试剂做终点指示剂,滴加0．01mol/L BaCl_2,砖红色为终点,根据BaCl_2用量计算SO_4^(2-)浓度。本方法快捷、准确、测定范围大,上限可达2000mg/L,克服了光度法测定浑浊水样引起误差大的缺点。

Use the sour barium intensity of light of chrome the method, EDTA titration the method, indirect atom to absorb the method, leave the son the color table method etc. the method measurement the SO4^2- the examination upper limit is all and very low（ 12- 200mgs/L）, and only be applicable to the clean water, if the water kind is turbid to then cause the bigger error margin. Some groundwater, SO4^2- the thick degree is high to amount to 44000mgs/L, use the BaCl2 titration the method measurement the SO4^2- ： Test water kind, with the bromophenol blue do the sour alkali to instruction, and add 1：50 hydrochloric acids, regulate are a pH= 3.5, affiliation 30 ml 2- propanol, try to do the terminal point the designation the, drop to add with the thorun 0.01mol/L BaCl2, brick red is for the terminal point, use to measure to compute the SO4^2- accosting to the BaCl2 - thick degree. This method is fast, accurate, the measurement scope is big, and the upper limit can amount to 2000mg/L, overcame the muddy water kind of measurement turbid of intensity of light method to cause the big weakness of error margin.