• 无水硫代硫酸钠  Sodium Thiosulfate,Chongqing Guangyi Chemical Co., Ltd,无水硫代硫酸钠  Sodium Thiosulfate
  • 无水硫代硫酸钠  Sodium Thiosulfate,Chongqing Guangyi Chemical Co., Ltd,无水硫代硫酸钠  Sodium Thiosulfate

无水硫代硫酸钠 Sodium Thiosulfate

No.CAS 7772-98-7
A versatile inorganic chemical. It acts as a photographic fixer to dissolve silver halides. In water treatment, it removes residual chlorine. It serves as a reducing agent for textile dechlorination after bleaching and dye‑fixing. It is widely used in laboratory iodometric titration as standard reagent. It also applies in electroplating and gold leaching. Medically, it can treat certain heavy‑metal and cyanide poisoning. It works as a key intermediate in many chemical synthesis processes.
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  • 无水硫代硫酸钠  Sodium Thiosulfate,Chongqing Guangyi Chemical Co., Ltd,无水硫代硫酸钠  Sodium Thiosulfate

Description

  1. 产品标识 / Product Identification

产品名称 Product Name

无水硫代硫酸钠 / Sodium Thiosulfate, Anhydrous(俗称:无水大苏打、海波 / "Hypo")

别名 Synonyms

无水大苏打、无水次亚硫酸钠、海波 / Sodium hyposulfite anhydrous, Hypo

化学式 Formula

Na₂S₂O₃

分子量 Molecular Weight

158.11 g/mol

CAS 登记号 CAS No.

7772-98-7

EC / EINECS 号

231-867-5

海关编码 HS Code

2832.30

PubChem CID

24477

InChIKey

AKHNMLFCWUSKQB-UHFFFAOYSA-L

主要用途 Primary Use

照相定影剂、水处理脱氯、纺织漂白后脱氯、皮革鞣制、氰化提金、碘量法滴定、医药解毒剂 / Photographic fixing, water dechlorination, textile antichlor, leather tanning, gold extraction, iodometric titration, cyanide antidote


  1. 组分信息 / Composition

主要成分 Main Component

无水硫代硫酸钠 Sodium Thiosulfate (anhydrous) ≥ 98.5%(工业级)/ ≥ 99.0%(分析纯 AR)

杂质 Impurities

干燥失重、水不溶物、硫酸盐/亚硫酸盐、氯化物、铁、重金属、硫化物(见第 4 节)/ Loss on drying, insolubles, sulfates/sulfites, chlorides, Fe, heavy metals, sulfides (see §4)


  1. 理化性质 / Physical & Chemical Properties (Anhydrous)

外观 Appearance

白色结晶性粉末或无色单斜结晶,无臭 / White crystalline powder or colorless monoclinic crystals, odorless

分子量 MW

158.11 g/mol

熔点 Melting Point

≈ 48 °C(分解;部分文献记为加热分解、无明确熔点)/ ~48 °C (decomposes); some sources report decomposition on heating, no distinct mp

沸点/分解 BP / Decomp.

加热分解(不沸腾)/ Decomposes on heating (does not boil)

密度 Density (20 °C)

1.667 g/cm³

水中溶解度 Solubility (H₂O)

易溶;20 °C 约 70 g/100 mL(文献值)/ Very soluble; ~70 g/100 mL at 20 °C (literature)

乙醇中溶解度 in EtOH

不溶 / Insoluble

pH(5% 水溶液, 20°C) pH (5% aq.)

6.0 – 8.5(近中性偏弱碱 near neutral-basic)

晶体结构 Crystal Structure

单斜晶系 / Monoclinic

潮解性 Hygroscopicity

易潮解,空气中吸湿 / Deliquescent, absorbs moisture in air


  1. 典型产品规格 / Typical Product Specifications (Industrial Grade, Anhydrous)

项目 Item

典型值 Typical

测试方法 Method

硫代硫酸钠含量 Na₂S₂O₃ assay(干基 dry basis)

≥ 98.5%

碘量法 / Iodometric

干燥失重 Loss on drying (105°C, 2h)

≤ 0.5%

重量法 / Gravimetric

水不溶物 Insoluble matter

≤ 0.05%

过滤法 / Filtration

硫酸盐及亚硫酸盐(以 SO₄ 计) Sulphate & sulphite (as SO₄)

≤ 0.5%

重量法 / Gravimetric

氯化物(以 Cl 计) Chloride (as Cl)

≤ 0.01%

铁(以 Fe 计) Iron (as Fe)

≤ 0.004%

AAS / ICP

重金属(以 Pb 计) Heavy metals (as Pb)

≤ 0.002%

AAS

硫化物(以 S 计) Sulfide (as S)

≤ 0.001%

pH(5% 水溶液, 20°C)

6.0 – 8.5

注:上述为工业级无水硫代硫酸钠通用典型指标。分析纯(AR)指标更严(含量 ≥ 99.0%、水不溶物 ≤ 0.015%、铁 ≤ 0.0005%、重金属 ≤ 0.0005%)。具体数值以重庆广益化工出厂检验单(COA)为准。 Note: typical industrial grade; AR grade stricter (assay ≥ 99.0%).

  1. 用途 / Applications
  • 照相感光定影剂(“海波”):溶解未曝光的卤化银
  • 水处理:余氯脱氯剂(中和漂白剂、自来水/泳池/水族脱氯)
  • 纺织:漂白后脱氯(antichlor)
  • 皮革鞣制助剂
  • 冶金:氰化提金及氰化物废水中和
  • 分析化学:碘量法滴定剂、温克勒溶解氧测定
  • 医药:氰化物中毒解毒剂(WHO 基本药物)
  • Photographic fixing, water dechlorination, textile antichlor, leather tanning, gold extraction, analytical titration, pharma antidote

  1. 储存与操作 / Storage & Handling
  • 密封防潮;阴凉、干燥、通风处存放,避免阳光直射与潮湿空气
  • 无水物易潮解,须严格密封;与酸类、强氧化剂隔离存放
  • 避免高温(>48 °C 可分解)
  • 操作佩戴防护手套、护目镜、防尘口罩;避免与酸接触(释放有毒 SO₂)
  • Store sealed & dry; segregate from acids/strong oxidizers; avoid heat; PPE (gloves, goggles, mask)

  1. 安全信息 / Safety Information

GHS 分类 GHS Classification

通常不分类(按分析纯试剂 SDS,无危险标识);粉尘有轻微刺激性 / Generally not classified as hazardous; dust may mildly irritate

防范建议 P-statements

P261 避免吸入粉尘;P264 操作后清洗;P280 戴防护手套/护目镜/口罩 / Avoid dust inhalation; wear PPE

NFPA 704

健康 Health 1 / 易燃 Flammability 0 / 反应 Reactivity 0

急性毒性 Acute Toxicity

LD₅₀(口服,大鼠 oral, rat)> 5000 mg/kg(低毒 low toxicity)

危险反应 Hazardous Reaction

与酸反应释放二氧化硫(SO₂)有毒气体;具强还原性 / Reacts with acid releasing toxic SO₂; strong reducing agent

灭火 Fire-fighting

不燃;使用水/干粉/CO₂,避免吸入分解产物 / Non-flammable; water/powder/CO₂; avoid fumes


  1. 包装 / Packaging

25 kg / 50 kg 塑料编织袋(内衬聚乙烯 PE 袋),可定制吨袋(jumbo bag)。 25/50 kg PP woven bags (PE-lined); jumbo bags on request.

  1. 保质期 / Shelf Life

在原包装、妥善密封防潮储存条件下 24 个月。 24 months in original sealed, dry storage.

  1. 法规与合规 / Regulatory & Compliance
  • 出口欧盟须满足进口方 REACH 义务;无水硫代硫酸钠(EC 231-867-5)为已登记物质。 EU exports subject to importer REACH; registered substance (EC 231-867-5).
  • 食品/医药用途须采用对应合规等级(USP/BP/FCC、E539)并符合相关法规。 For food/pharma use, apply compliant grade (USP/BP/FCC, E539).
  • 通常不作为危险货物运输;具体 shipment 建议按最新 IATA/IMDG 确认。 Generally not regulated as dangerous goods; confirm per latest IATA/IMDG.

 

免责声明 / Disclaimer:本技术数据表仅供参考,不构成任何担保。数据基于编制时可得的公开信息,重庆广益化工有限公司不对因使用本表所产生的任何后果承担责任。实际技术参数请以每批次出厂 COA 为准。 This TDS is for reference only and does not constitute a warranty. Values per batch COA prevail.

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