焦亚硫酸钠 Sodium metabisulfite (SMBS)

CAS 登记号 CAS No.

7681-57-4

分子式 Molecular formula

Na2S2O5（(Na2O5S2)）

分子量 Molecular weight

190.11 g/mol

EC 号 EC / EINECS

231-673-0

RTECS 号 RTECS

UX8225000

HS 编码 HS Code

2832100000（中国 8 位 28321000；10 位 2832100000；注：部分归类实践亦归 28322000 其他亚硫酸盐）

China 8-digit 28321000; 10-digit 2832100000; note: some practices also use 28322000 (other sulfites)

UN 编号 / 危险类别 UN / Class

依主要 SDS 可归 UN 3260，第 8 类（腐蚀性固体·酸性·无机 n.o.s.），包装类别 III；干品亦有 SDS 判定为非危险货物

Per major SDS may be UN 3260, Class 8 (Corrosive solid, acidic, inorganic, n.o.s.), PG III; dry product also treated as non-dangerous by some SDS

中国危险货物编号 China DG No.

未专项列名（干品按普通化学品管理，溶液按承运人判定）/ not specifically listed (dry product managed as ordinary chemical; solution per carrier)

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

焦亚硫酸钠；偏重亚硫酸钠；偏亚硫酸氢钠；Sodium metabisulfite；Sodium pyrosulfite；Disodium disulfite；E223

项目 Item

指标 Specification (典型值 Typical)

测试方法 Test Method

含量 Assay (Na2S2O5)

>= 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

白色至类白色结晶性粉末 / White to off-white crystalline powder

目视 Visual

二氧化硫含量 SO2 content

>= 64.0 % / >=64.0%

滴定 Titration

溶解度 Solubility (20 °C)

约 540 g/L（水）；微溶于乙醇 / ~540 g/L (water); slightly sol. in ethanol

—

pH（50 g/L 水溶液，20 °C）

约 3.5 – 5.0（酸性）/ ~3.5-5.0 (acidic)

pH 计 pH meter

水不溶物 Insolubles

<= 0.005 %（食品级）/ <=0.005% (food grade)

过滤 Filtration

重金属（以 Pb 计）Heavy metals (as Pb)

<= 10 ppm（食品级）/ <=10 ppm (food grade)

原子吸收 AAS

砷 Arsenic (As)

<= 1 – 2 ppm（食品级）/ <=1-2 ppm (food grade)

比色 Colorimetry

分子式 Molecular formula

Na2S2O5（(Na2O5S2)）

分子量 Molecular weight

190.11 g/mol

外观 Appearance

白色至类白色结晶性粉末；有二氧化硫气味

White to off-white crystalline powder; sulfur dioxide odor

熔点 Melting point

约 150 °C（分解）/ ~150 C (decomposes)

沸点 Boiling point

分解（无清晰沸点）/ Decomposes (no clean BP)

密度 Density

约 1.48 g/cm3

~1.48 g/cm3

pH（50 g/L 水溶液，20 °C）

约 3.5 – 5.0（酸性）/ ~3.5-5.0 (acidic)

溶解度 Solubility

约 540 g/L（水，20 °C），溶于水放出 SO2；微溶于乙醇

~540 g/L (water, 20 C, releases SO2 on dissolution); slightly sol. in ethanol

稳定性 Stability

稳定；强还原剂。受热分解放出 SO2；空气中氧化为硫酸盐；与强氧化剂、强酸不相容（遇酸释放大量有毒 SO2）；对湿与空气敏感

Stable; strong reducing agent. Decomposes on heating releasing SO2; oxidizes to sulfate in air; incompatible with strong oxidizers and strong acids (releases large amounts of toxic SO2); moisture- and air-sensitive

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

非易燃固体（遇热分解放出 SO2 有毒烟气）/ Non-combustible solid (decomposes on heating, emits toxic SO2 fumes)

食品与饮料：作防腐剂、抗氧化剂、漂白剂（食品添加剂 E223），用于葡萄酒、干果、啤酒等。

Food & beverage: preservative, antioxidant and bleaching agent (food additive E223) for wine, dried fruit, beer, etc.

纺织印染：作漂白后除氯剂（抗氯剂）、染色还原工序助剂。

Textile & dyeing: post-bleaching anti-chlor (dechlorinator) and dyeing-reduction aid.

水处理：作脱氧剂、脱氯剂，用于锅炉给水、市政与工业废水处理（如去除六价铬）。

Water treatment: oxygen scavenger and dechlorinator for boiler feedwater and municipal/industrial wastewater (e.g. Cr(VI) reduction).

冶金与化工：金矿氰化尾液除氰、有机合成还原剂、照相显影定影辅助。

Metallurgy & chemicals: cyanide destruction in gold cyanidation, organic-synthesis reducing agent, photographic processing aid.

其他：造纸漂白、洗涤剂/清洁剂配制、防腐。

Other: paper bleaching, detergent/cleaner formulation, preservation.

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（非易燃但受热分解放毒气）。

Store in a cool, dry, well-ventilated area; keep containers tightly closed against moisture and aerial oxidation; away from ignition/heat (non-flammable but emits toxic gas on heating).

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。通风不良处须佩戴防毒面具。

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; use respirator in poorly ventilated areas.

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.

注意：依主要 SDS 可归 UN 3260 / 第 8 类 腐蚀性固体 PG III（干品亦有 SDS 判定非危）；出口须随附合规 SDS/标签与商检，并以承运人判定为准。

Note: per major SDS may be UN 3260 / Class 8 corrosive solid PG III (dry product also treated as non-dangerous by some SDS); export requires compliant SDS/labels and commodity inspection, subject to carrier.

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，GHS05（腐蚀）、GHS07（急性/刺激）；信号词 危险/Danger。H302（吞咽有害）、H315（皮肤刺激）、H318（严重眼损伤）、H334（吸入可能致过敏或哮喘症状/呼吸困难）。补充危害：与酸接触释放有毒气体（SO2）。象形图：GHS05、GHS07。

GHS classification: per major SDS, GHS05 (Corrosive), GHS07 (Acute/Irritant); Signal word Danger. H302 (harmful if swallowed), H315 (skin irritation), H318 (serious eye damage), H334 (may cause allergy or asthma symptoms or breathing difficulties if inhaled). Supplementary: contact with acids liberates toxic gas (SO2). Pictograms: GHS05, GHS07.

⚠ 关键危害：强还原剂，遇酸释放大量有毒 SO2 气体；与强氧化剂混合有燃烧爆炸危险；对皮肤、眼睛有腐蚀性/刺激性，可严重损伤眼睛。非易燃固体，受热分解放出 SO2 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 large amounts of toxic SO2 on contact with acid; may burn/explode with strong oxidizers; corrosive/irritant to skin and eyes, can seriously damage eyes. Non-combustible solid; decomposes on heating emitting toxic SO2. Extinguish with plenty of water and sand; firefighters upwind with respirators and full protection.

健康危害：吞咽有害（H302）；皮肤接触刺激/腐蚀（H315）；眼睛接触严重损伤（H318，清水冲洗≥15 min 并就医）；吸入粉尘呼吸道刺激，敏感者诱发哮喘/过敏（H334）。操作时做好职业防护与通风。

Health: harmful if swallowed (H302); skin contact irritates/corrodes (H315); eye contact serious damage (H318, flush >=15 min and seek care); inhaled dust irritates respiratory tract and may trigger asthma/allergy in sensitive persons (H334). Use PPE and ventilation.

运输信息 Transport：依主要 SDS 可归 UN 3260，第 8 类（腐蚀性固体·酸性·无机 n.o.s.），包装类别 III；干品亦有 SDS 判定为非危险货物。个别归类存在差异，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 may be UN 3260, Class 8 (Corrosive solid, acidic, inorganic, n.o.s.), PG III; dry product also treated as non-dangerous by some SDS. Classification varies; 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 E223。

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 E223.

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).