无水碳酸钠

性状描述: 白色粉末或颗粒。无气味。有碱味。有吸湿性。露置空气中逐渐吸收 1mol/L水分(约15%)。400℃时开始失去二氧化碳。遇酸分解并泡腾。溶于水(室温时3.5份,35℃时2.2份)和甘油,不溶于乙醇。水溶液呈强碱性,pH 11.6。相对密度2.53。熔点851℃。半数致死量(30日)(小鼠,腹腔)116.6mg/kg。有刺激性。

质量标准: GB/T 639-86                            
项目Item                               优级纯   分析纯    化学纯
                                        (GR)     (AR)     (CP)
含量(Na₂CO₃)Assay,%                   ≥99.8     99.8      99.8
澄清度试验Clarity                       合格     合格      合格
水不溶物Insoluble matter in water,%   ≤0.005    0.01      0.02
干燥失重(300℃)Drying loss,%          ≤0.5      1.0       1.0  
氯化物(Cl)Chloride,%                  ≤0.001    0.002     0.005
硫化合物(以SO₄计)Sulfate compounds,%  ≤0.003    0.005     0.01
氮化合物(N)Nitrogen compounds,%       ≤0.001    0.001     0.002
磷酸盐及硅酸盐(以SiO₃计)              ≤0.0025   0.006     0.013
Phosphate and Silicate,%
镁(Mg)Magnesium,%                     ≤0.0005   0.002     0.005
铝(Al)Aluminum,%　                    ≤0.001    0.003     0.01
钾(K)Potassium,%　                    ≤0.005    0.005     0.002
钙(Ca)Calcium,%                       ≤0.005    0.01      0.02
铁(Fe)Iron,%                          ≤0.0003   0.0005    0.001
重金属(以Pb计)Heavy metals,%          ≤0.0005   0.0005    0.001

GB 1255-90
项目Item                                 基准试剂
                                           (PT)
含量(Na₂CO₃)Assay,%                     99.5-100.05
澄清度试验Clarity                          合格  
灼烧失重Ignition loss,%                  ≤0.5
氯化物(Cl)Chloride,%                     ≤0.001
硫化合物(以SO₄计)Sulfate compounds,%     ≤0.003
总氮量(N)Total nitrogen,%                ≤0.001
磷酸盐及硅酸盐(以SiO₃计)                 ≤0.0025
Phosphate and Silicate,%
镁(Mg)Magnesium,%                        ≤0.0005
铝(Al)Aluminum,%　                       ≤0.001
钾(K)Potassium,%　                       ≤0.005
钙(Ca)Calcium,%                          ≤0.01
铁(Fe)Iron,%                             ≤0.0003
重金属(以Pb计)Heavy metals,%             ≤0.0005      

ACS级
项目名称　                               ACS Grade
含量(干基)Assay                          ≥99.5%
水不溶物Insoluble matter                 ≤0.01%
干燥失重（285℃）Loss on drying at 285℃ ≤1.0%
氯化物(Cl)Chloride                       ≤0.001%
磷酸盐(PO₄)Phosphate                     ≤0.001%
硅酸盐（以SiO₂计)Silica                  ≤0.005%
硫化合物(以SO₄计)Sulfur compounds        ≤0.003%
重金属(以Pb计)Heavy metals               ≤5ppm
铁(Fe)Iron                               ≤5ppm
钙(Ca)Calcium                            ≤0.03%
镁(Mg)Magnesium                          ≤0.005%
钾(K)Potassium                           ≤0.005%


99.99% metals basis:


外观Appearance                          white granular powder
X-射线衍射分析X-Ray Diffraction         Conforms to standard
纯度Purity                              ≥99.99% Based on Trace Metals Impurities of ICP
CO3  by titration with HCl              ≥55.4%
痕量金属分析total metallic impurities   ≤200ppm by ICP Atomic emission



99.999% metals basis:


外观Appearance                          white powder
X-射线衍射分析X-Ray Diffraction         Conforms to standard
纯度Purity                              ≥99.999% Based on Trace Metals Impurities of ICP
CO3  by titration with HCl              ≥55.6%
ICP:                                    Confirms Sodium Component Confirmed
痕量金属分析total metallic impurities   ≤20ppm by ICP Atomic emission
(Li、K、Cs、Sc、Mg、Ba、Al、Tl、Cr、Fe) ppm



99.9999% metals basis:


外观Appearance                          white powder
X-射线衍射分析X-Ray Diffraction         Conforms to standard
纯度Purity                              ≥99.9999% Based on Trace Metals Impurities of ICP
CO3  by titration with HCl              ≥55.6%
ICP:                                    Confirms Sodium Component Confirmed
痕量金属分析total metallic impurities   ≤20ppm by ICP Atomic emission
总氮total nitrogen (N)                  ≤10 ppm  
氯chloride (Cl-):                       ≤10 ppm
磷酸根phosphate (PO43-):                ≤5 ppm
二氧化硅silicate (as SiO2):             ≤5 ppm
硫酸根sulfate (SO42-):                  ≤10 ppm
cation traces by ICP-MS
  Al: ≤0.05 ppm
  As: ≤0.01 ppm
  Ba: ≤0.2 ppm
  Ca: ≤0.1 ppm
  Cd: ≤0.005 ppm
  Co: ≤0.005 ppm
  Cu: ≤0.005 ppm
  Fe: ≤0.05 ppm
  Hg: ≤0.005 ppm
  K: ≤1 ppm
  Li: ≤0.5 ppm
  Mg: ≤0.1 ppm
  Mn: ≤0.01 ppm
  Ni: ≤0.01 ppm
  Pb: ≤0.01 ppm
  Sr: ≤0.1 ppm
  Tl: ≤0.01 ppm
  Zn: ≤0.01 ppm

储存条件: 密封干燥保存。

用途: 定量分析中标定酸液的 基准。测定铝、硫、铜、铅和锌。检验尿液和全血葡萄糖。分析水泥中二氧化硅的助熔剂。金属金相分析等。