无水亚硫酸钠 Sodium sulfite

CAS 登记号 CAS No.

7757-83-7（无水物；七水合物 10102-68-8）/ 7757-83-7 (anhydrous; heptahydrate 10102-68-8)

分子式 Molecular formula

Na2SO3（(Na2O3S)）

分子量 Molecular weight

126.04 g/mol

EC 号 EC / EINECS

231-821-4

MDL 号 MDL number

MFCD00003503

RTECS 号 RTECS

WE2150000

HS 编码 HS Code

2832100000（中国 8 位 28321000；10 位 2832100000，亚硫酸钠）

China 8-digit 28321000; 10-digit 2832100000 (sodium sulfite)

UN 编号 / 危险类别 UN / Class

非危险货物（依主要 SDS，RIDADR NONH for all modes）；水溶液按承运人判定

Not a dangerous good (per major SDS, RIDADR NONH for all modes); aqueous solutions per carrier

中国危险货物编号 China DG No.

未专项列名（按普通化学品管理）/ not specifically listed (managed as ordinary chemical)

中国危险化学品目录序号

未列入《危险化学品目录(2015版)》（现行有效）/ NOT listed in Catalog of Hazardous Chemicals (2015 ed.), current in-force

别名 Synonyms

亚硫酸钠；无水亚硫酸钠；硫养粉；Sodium sulfite；Disodium sulfite；Sodium sulphite；E221

项目 Item

指标 Specification (典型值 Typical)

测试方法 Test Method

含量 Assay (Na2SO3)

>= 96.0 %（工业级）；>= 97.0 %（食品级）/ >=96.0% (industrial); >=97.0% (food)

碘量法滴定 Iodometric titration

外观 Appearance

白色结晶性粉末或颗粒 / White crystalline powder or granules

目视 Visual

溶解度 Solubility (20 °C)

约 23 g/100 mL（水）；不溶于乙醇 / ~23 g/100 mL (water); insol. in ethanol

—

pH（1 M 水溶液，25 °C）

约 9.0 – 10.5（碱性）/ ~9.0-10.5 (alkaline)

pH 计 pH meter

水不溶物 Insolubles

<= 0.02 %（食品级更严）/ <=0.02% (stricter for food)

过滤 Filtration

重金属（以 Pb 计）Heavy metals (as Pb)

<= 10 – 20 ppm（食品级）/ <=10-20 ppm (food grade)

原子吸收 AAS

游离碱 Free alkali

符合试剂/食品级限度 / within reagent/food limits

滴定 Titration

分子式 Molecular formula

Na2SO3（(Na2O3S)）

分子量 Molecular weight

126.04 g/mol

外观 Appearance

白色结晶性粉末或颗粒

White crystalline powder or granules

熔点 Melting point

约 500 °C（受热分解）；七水合物约 33.4 °C 熔化失水

~500 C (decomposes); heptahydrate melts ~33.4 C losing water

沸点 Boiling point

分解（无清晰沸点）/ Decomposes (no clean BP)

密度 Density

约 2.63 g/cm3（无水）/ ~2.63 g/cm3 (anhydrous)

pH（1 M 水溶液，25 °C）

约 9.0 – 10.5（碱性）/ ~9.0-10.5 (alkaline)

溶解度 Solubility

约 23 g/100 mL（水，20 °C）；不溶于乙醇

~23 g/100 mL (water, 20 C); insoluble in ethanol

稳定性 Stability

稳定；强还原剂。潮湿空气中易被氧化为硫酸盐（较七水合物更稳定）；与强酸不相容（遇酸释放 SO2）；具吸湿性

Stable; strong reducing agent. Oxidizes to sulfate in moist air (more stable than the heptahydrate); incompatible with strong acids (releases SO2); hygroscopic

禁配物 Incompatibilities

强氧化剂、强酸

Strong oxidizers, strong acids

NFPA 704

健康 2

易燃 0 / 反应 1（强还原剂；与酸反应释放 SO2）/ Health 2 / Flammability 0 / Reactivity 1 (strong reducing agent; releases SO2 with acid)

燃烧性 Flammability

不燃固体（受热分解放出硫化物有毒烟气）/ Non-combustible solid (decomposes on heating, emits toxic sulfide fumes)

食品与饮料：作防腐剂、抗氧化剂（食品添加剂 E221），用于干果、葡萄酒、马铃薯制品护色保鲜。

Food & beverage: preservative and antioxidant (food additive E221) for dried fruit, wine, potato products.

水处理：作脱氧剂（除溶解氧）、脱氯剂，用于锅炉给水、冷却水与废水处理。

Water treatment: oxygen scavenger (removes dissolved O2) and dechlorinator for boiler feedwater, cooling water and wastewater.

纺织印染：作漂白后除氯剂、染色还原工序助剂。

Textile & dyeing: post-bleaching chlorine remover and dyeing-reduction aid.

造纸与化工：纸浆蒸煮助剂、有机合成还原剂、显影定影辅助。

Pulp & paper and chemicals: pulping aid, organic-synthesis reducing agent, photographic processing aid.

其他：皮革处理、采矿（浮选/浸出）、分析试剂。

Other: leather treatment, mining (flotation/leaching), analytical reagent.

储存于阴凉、干燥、通风良好的库房；容器须密封，防止吸湿与空气氧化变质；远离火种热源。

Store in a cool, dry, well-ventilated area; keep containers tightly closed against moisture and aerial oxidation; away from ignition/heat.

与强酸、强氧化剂、食品及饲料分开存放，切忌混储；搬运时轻装轻卸，防止包装破损。

Segregate from strong acids, strong oxidizers, food and feed; no mixed storage; handle gently to avoid package damage.

操作人员佩戴防尘口罩（N95/FFP2）、防护眼镜、防化学品手套（丁腈/橡胶）与防护服；作业现场禁止吸烟进食饮水；工后更衣。避免扬尘与皮肤/眼睛接触、避免吸入粉尘。

Operators wear dust mask (N95/FFP2), goggles, chemical-resistant gloves (nitrile/rubber) and protective clothing; no smoking/eating/drinking on site; change clothes after work. Avoid dust, skin/eye contact and inhalation.

固体：常见 25 kg、50 kg 塑料编织袋（内衬塑料袋）或纸塑复合袋；亦可根据客户需求提供 500 kg / 1000 kg 吨袋等。

Solid: commonly 25 kg, 50 kg in plastic-woven bags (inner PE liner) or paper-plastic composite bags; 500 kg / 1000 kg FIBC totes available on request.

溶液：依浓度与用途采用 25 kg、200 kg 塑料桶或 IBC 吨桶。注意：固体依主要 SDS 为非危险货物（NONH），水溶液按承运人及相关法规判定；出口须随附合规 SDS/标签与商检。

Solution: 25 kg, 200 kg plastic drums or IBC totes by concentration/use. Note: solid per major SDS is non-dangerous (NONH), aqueous solutions per carrier and regulation; export requires compliant SDS/labels and commodity inspection.

在原包装、密封、阴凉干燥（防潮、防氧化、远离酸与氧化剂）条件下，建议保质期 12–24 个月。开封后宜尽快使用。

Recommended shelf life 12-24 months under original sealed packaging, cool and dry (moisture-proof, against oxidation, away from acids and oxidizers). Use promptly after opening.

GHS 危险性分类：依主要 SDS，GHS07（刺激）；信号词 警告/Warning。H315（皮肤刺激 2 类）、H319（严重眼刺激 2 类）、H335（特异性靶器官毒性·单次接触 3 类，呼吸道刺激）。象形图：GHS07。部分 SDS 另列 H303（吞咽可能有害）。

GHS classification: per major SDS, GHS07 (Irritant); Signal word Warning. H315 (Skin Irrit. 2), H319 (Eye Irrit. 2), H335 (STOT SE 3, respiratory irritation). Pictogram: GHS07. Some SDS also list H303 (may be harmful if swallowed).

⚠ 关键危害：强还原剂，遇酸释放有毒 SO2 气体；与强氧化剂混合有燃烧爆炸危险；对皮肤、眼睛、呼吸道有刺激性。不燃固体，受热分解放出硫化物有毒烟气。灭火可用大量水、砂土；消防人员须在上风向，佩戴防毒面具与全身防护。

⚠ Key hazard: strong reducing agent releasing toxic SO2 on contact with acid; may burn/explode with strong oxidizers; irritates skin, eyes, respiratory tract. Non-combustible solid; decomposes on heating emitting toxic sulfide fumes. Extinguish with plenty of water and sand; firefighters upwind with respirators and full protection.

健康危害：皮肤接触刺激（H315）；眼睛接触严重刺激（H319，清水冲洗≥15 min 并就医）；吸入粉尘呼吸道刺激（H335）；吞咽可能有害（H303）。操作时做好职业防护与通风。

Health: skin contact irritates (H315); eye contact serious irritation (H319, flush >=15 min and seek care); inhaled dust irritates respiratory tract (H335); swallowing may be harmful (H303). Use PPE and ventilation.

运输信息 Transport：依主要 SDS 为非危险货物（RIDADR NONH for all modes），按普通化学品管理；水溶液按承运人及相关法规判定。出口须随附合规 SDS/标签与商检，并以目的国法规与承运人判定为准。

Transport: per major SDS NOT a dangerous good (RIDADR NONH for all modes), managed as ordinary chemical; aqueous solutions per carrier and regulation. Export requires compliant SDS/labels and commodity inspection, per destination regulation and carrier.

法规 Regulatory：经核未列入中国《危险化学品目录(2015版)》（现行有效）；不属于易制毒（第445号令三类均不受管控）、不属于易制爆（2017版名录）、不属于重点监管/监控化学品；已列入《中国现有化学物质名录(2013)》。德国 WGK 1。美国 TSCA 已列；欧盟 REACH 已注册（Active）；食品添加剂 E221。

Regulatory: verified NOT listed in China's (current in-force); NOT a precursor (Decree 445, all categories not controlled), NOT explosively-unstable (2017 list), NOT key-supervised/monitored; listed in IECSC (2013). Germany WGK 1. US TSCA listed; EU REACH registered (Active); food additive E221.

NFPA 704：健康 2 / 易燃 0 / 反应 1（强还原剂；与酸反应释放 SO2）。

NFPA 704: Health 2 / Flammability 0 / Reactivity 1 (strong reducing agent; releases SO2 with acid).