What is the method for detecting anhydrous sodium sulfite impurities? Impurities in anhydrous sodium sulfite refer to impurities such as iron salts and heavy metals contained in anhydrous sodium sulfite. There are many impurities, and the quality grade of anhydrous sodium sulfite is general; Less impurities means high purity and stable performance, so the purification method of anhydrous sodium sulfite is very important.

买到的无水亚硫酸钠后，需对其杂质检测，杂质符合自身使用要求，方可投入生产，获取更多的经济效益，无水亚硫酸钠中的杂质的检测方法如下：

After the anhydrous sodium sulfite is purchased, its impurities need to 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、无水亚硫酸钠水溶液（1→10）显碱性，并且溶液显亚硫酸盐的鉴别反应。

1. Anhydrous sodium sulfite aqueous solution (1 → 10) is alkaline, and the solution shows the identification reaction of sulfite.

2、无水亚硫酸钠水溶液显钠盐的鉴别反应。

2. Identification reaction of sodium salt in anhydrous sodium sulfite aqueous solution.

检测：

testing:

溶液的澄清度与颜色

Clarity and color of solution

取无水亚硫酸钠水溶液1.0g，加水20ml使溶解，溶液透明无色。硫代硫酸盐取本品1.0g，加水15ml溶解后，加稀盐酸5ml，摇匀，静置5分钟，不得产生浑浊。

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.

重金属杂质检测

Heavy metal impurity detection

取无水亚硫酸钠水溶液1.0g，依法检查。含重金属不得过百万分之二十。 砷盐 取本品0.5g，加水10ml溶解后，加硫酸1ml，置砂浴上蒸白烟冒出，放冷，加水21ml与盐酸5ml，依法检查，应符合规定（0.0004%）。

Take 1.0g anhydrous sodium sulfite aqueous solution and check it 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 it according to law. It should meet the requirements (0.0004%).

含量测定：取无水亚硫酸钠水溶液约0.20g，加碘滴定液（0.05mol/L）50ml，密塞，振摇使溶解，在暗处放置5分钟．用硫代硫酸钠滴定液（0.1mol/L）滴定，近终点时，加淀粉指示液1ml，继续滴定蓝色消失，并将滴定的结果用空白试验校正。每1ml碘滴定液（0.05mol/L）相当于6.302mg的亚硫酸钠。

Content determination: take about 0.20g of anhydrous sodium sulfite aqueous solution, 50ml of iodine titrant (0.05mol / L), close it, shake it to dissolve, and place it in the dark for 5 minutes. Titrate with sodium thiosulfate titrant (0.1mol / L). When it is close to the end point, add 1ml of starch indicator solution, continue titration until the blue color 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.

无水亚硫酸钠作用大，用途广，作为还原剂，在纺织，造纸等领域的成就都比较好。

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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