買到的無水亞硫酸鈉后，需對其雜質檢測，雜質符合自身使用要求，方可投入生產，獲取更多的經濟效益，無水亞硫酸鈉中的雜質的檢測方法如下：
After the anhydrous sodium sulfite is purchased, its impurities shall be detected. The impurities can be put into production only if they meet their own use requirements, so as to obtain more economic benefits. The detection methods of impurities in anhydrous sodium sulfite are as follows:
1、無水亞硫酸鈉水溶液（1→10）顯堿性，并且溶液顯亞硫酸鹽的鑒別反應。
1. Anhydrous sodium sulfite aqueous solution (1 → 10) is alkaline, and the solution shows the identification reaction of sulfite.
2、無水亞硫酸鈉水溶液顯鈉鹽的鑒別反應。
2. Identification of sodium salt in anhydrous sodium sulfite aqueous solution.
檢測：
testing:
溶液的澄清度與顏色
Clarity and color of solution
取無水亞硫酸鈉水溶液1.0g，加水20ml使溶解，溶液透明無色。硫代硫酸鹽取本品1.0g，加水15ml溶解后，加稀鹽酸5ml，搖勻，靜置5分鐘，不得產生渾濁。
Take 1.0g anhydrous sodium sulfite aqueous solution and add 20ml water to dissolve it. The solution is transparent and colorless. Thiosulfate take 1.0g of this product, dissolve it with 15ml of water, add 5ml of dilute hydrochloric acid, shake it well, and let it stand for 5 minutes without turbidity.
重金屬雜質檢測
Heavy metal impurity detection
取無水亞硫酸鈉水溶液1.0g，依法檢查。含重金屬不得過百萬分之二十。 砷鹽 取本品0.5g，加水10ml溶解后，加硫酸1ml，置砂浴上蒸至白煙冒出，放冷，加水21ml與鹽酸5ml，依法檢查，應符合規定（0.0004%）。
Take 1.0g anhydrous sodium sulfite aqueous solution and check according to law. The content of heavy metals shall not exceed 20 parts per million. Arsenic salt take 0.5g of this product, add 10ml of water to dissolve it, add 1ml of sulfuric acid, steam it in a sand bath until white smoke comes out, cool it, add 21ml of water and 5ml of hydrochloric acid, and check according to law. It should meet the requirements (0.0004%).
含量測定：取無水亞硫酸鈉水溶液約0.20g，精密稱定，精密加碘滴定液（0.05mol/L）50ml，密塞，振搖使溶解，在暗處放置5分鐘．用硫代硫酸鈉滴定液（0.1mol/L）滴定，至近終點時，加淀粉指示液1ml，繼續滴定至藍色消失，并將滴定的結果用空白試驗校正。每1ml碘滴定液（0.05mol/L）相當于6.302mg的亞硫酸鈉。
Content determination: take about 0.20g of anhydrous sodium sulfite aqueous solution, weigh accurately, add 50ml of precision iodine titration solution (0.05mol / L), close it, shake it to dissolve, and place it in the dark for 5 minutes. Titrate with sodium thiosulfate titration solution (0.1mol / L). When it is close to the end point, add 1ml of starch indicator solution, continue to titrate until the blue disappears, and correct the titration result with blank test. Every 1ml of iodine titrant (0.05mol/l) is equivalent to 6.302mg of sodium sulfite.
無水亞硫酸鈉作用大，用途廣，作為還原劑，在紡織，造紙等領域的成就都比較好。
Anhydrous sodium sulfite has great function and wide application. As a reducing agent, it has made good achievements in textile, papermaking and other fields.
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