方法：采用硫酸根离子沉淀法。

Methods: Sulfate ion precipitation method was used.

亚硫酸根离子可把酸化重铬锰酸钾由橙色变成绿色。

So 3 - can turn acidified potassium dichromate solution from orange to green.

烧碱和纯碱是基本化工原料，盐卤中硫酸根的存在严重影响这两种碱及精制盐的生产。

Soda ash and caustic soda are basic raw material in chemical industry. Existence of sulfate in brine has great impact on the production of soda and refined salt.

对膜法除硝过程中，贫硝、富硝和芒硝的硫酸根的测定方法进行了实验。

The detection method of low and high content Glauber salt, and sulfate radical in Glauber salt removal by membrane method were tested.

结果济南市冬季PM_（2.5）平均水平历城区高于市中区，两监测点PM_（2.5）中含量最高的前四类成分分别是硝酸根离子、硫酸根离子、铵离子、氯离子；

Results The level of PM_(2.5) in winter is higher in Licheng District than that in Shizhong District of Jinan, the four highest ion components in PM_(2.5) were NO_3~-, SO_4~(2-), NH_4~+ and Cl~-.