二氧化硫还原的铬鞣液 sulfur dioxide reduced chrome
为减少二氧化硫其中氨作为还原剂使用的方法。
A method for reducing sulfur dioxide wherein ammonia is used as the reducing agent.
二段浸出后的滤液用二氧化硫烟道气还原，还原液经冷冻结晶、水溶、过滤、精制后可得纯度较高的精白砷。
High purity arsenic trioxid was obtained from the 2nd stage filtrate by reduction with SO2 flue gas, freeze crystallization, water dissolving, filtering and refining.
方法：用甲醛吸收液吸收经蒸馏释放出的二氧化硫，再用还原光度法测定。
Method: Sulfur dioxide released from wine by distillation was absorbed with formaldehyde absorption solution, and then determination was conducted by reduction photometry.
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