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Sodium sulfite anhydrous

Cas:
7757-83-7
Molecular Structure:
MDL:
MFCD00003503
Molecular Formula:
Na2SO3
Molecular Weight:
126.04
Alias:
亚硫酸钠,硫养粉 Sulfurous acid disodium salt Sodium sulfite anhydrous sodium sulfite disodium sulfite Exsiccated sodium sulfite
Product order:
Name Specifications Packing Price Delivery
Sodium sulfite anhydrous AR 500g RMB 33 Consulting service
Sodium sulfite anhydrous CP 500g RMB 22 Consulting service
Sodium sulfite anhydrous ACS 500g RMB 44 Consulting service
Character:
白色结晶结晶性粉末。有二氧化硫气味。干燥时稳定。对湿敏感。较结晶亚硫酸钠稳定,但久贮可氧化成硫酸钠,加热分解为硫酸钠和硫化钠。溶于水,溶于甘油,不溶于乙醇。水溶液呈碱性,pH约为9。半数致死量(大鼠,静脉)115mg/kg。有刺激性。
密度:2.633
熔点:500 °C
Quality Standard:
HG/T 3-1078-77
项目Item                                  分析纯     化学纯
                                           (AR)       (CP)
含量(Na2SO3)Assay,%                      ≥97.0       95.0  
澄清度试验Clarity                         合格       合格
水不溶物lnsoluble matter in water,%      ≤0.005      0.01  
酸性亚硫酸盐(以NaHSO3计)Acid sulfite       合格       合格
游离碱(以Na2CO3计)Free alkalies,%        ≤0.2        0.3
氯化物(Cl)Chloride,%                     ≤0.005      0.02
硫代硫酸盐(S2O3)Thiosulfate,%            ≤0.005      0.02
铁(Fe)Iron,%                             ≤0.0005     0.002
砷(As)Arsenic,%                          ≤0.0001     0.0005
重金属(以Pb计)Heavy metals,%             ≤0.001      0.002

ACS级
项目名称                                            ACS Grade
含量(Na2SO3)Assay                                    ≥98.0%
水不溶物Insoluble matter                             ≤0.005%
游离酸Free acid                                      Passes test
可滴定游离碱Titrable free base                       ≤0.03meq/g
氯化物(Cl)Chloride                                   ≤0.02%
重金属(以Pb计)Heavy metals                           ≤0.001%
铁(Fe)Iron                                           ≤0.001%

Storage:
密封避光阴凉处保存。
用于制亚硫酸纤维素酯、硫代硫酸钠、有机化学药品、漂白织物等, 还用作还原剂、防腐剂、去氯剂等。
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