性 狀：    白色粉末,無氣味。有堿味。有吸濕性。露置空氣中逐漸吸收 1mol/L水分(約15%)。400℃時(shí)開始失去二氧化碳。遇酸分解并泡騰。溶于水(室溫時(shí)3.5份，35℃時(shí)2.2份)和甘油，不溶于醇。水溶液呈強(qiáng)堿性，pH11.6。半數(shù)致死量(30日)(小鼠中，腹腔)116.6mg/kg。有刺激性。
密度：2.53
熔點(diǎn)：851℃
沸點(diǎn):1600℃    

質(zhì)量標(biāo)準(zhǔn)：     
   GB/T 639-86                            
項(xiàng)目Item                         優(yōu)級(jí)純   分析純    化學(xué)純
                                        (GR)     (AR)     (CP)
含量(Na2CO3)Assay,%                   ≥99.8     99.8      99.8
澄清度試驗(yàn)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計(jì))Sulfate compounds,%  ≤0.003    0.005     0.01
氮化合物(N)Nitrogen compounds,%       ≤0.001    0.001     0.002
磷酸鹽及硅酸鹽(以SiO3計(jì))              ≤0.0025   0.006     0.013
Phosphate and Silicate,%
鎂(Mg)Magnesium,%                     ≤0.0005   0.002     0.005
鋁(Al)Aluminum,%                     ≤0.001    0.003     0.01
鉀(K)Potassium,%                     ≤0.005    0.005     0.002
鈣(Ca)Calcium,%                       ≤0.005    0.01      0.02
鐵(Fe)Iron,%                          ≤0.0003   0.0005    0.001
重金屬(以Pb計(jì))Heavy metals,%          ≤0.0005   0.0005    0.001

GB 1255-90
項(xiàng)目Item                            基準(zhǔn)試劑
                                           (PT)
含量(Na2CO3)Assay,%                     99.5-100.05
澄清度試驗(yàn)Clarity                          合格  
灼燒失重Ignition loss,%                  ≤0.5
氯化物(Cl)Chloride,%                     ≤0.001
硫化合物(以SO4計(jì))Sulfate compounds,%     ≤0.003
總氮量(N)Total nitrogen,%                ≤0.001
磷酸鹽及硅酸鹽(以SiO3計(jì))                 ≤0.0025
Phosphate and Silicate,%
鎂(Mg)Magnesium,%                        ≤0.0005
鋁(Al)Aluminum,%                        ≤0.001
鉀(K)Potassium,%                        ≤0.005
鈣(Ca)Calcium,%                          ≤0.01
鐵(Fe)Iron,%                             ≤0.0003
重金屬(以Pb計(jì))Heavy metals,%             ≤0.0005      

ACS級(jí)
項(xiàng)目名稱                                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%
磷酸鹽(PO4)Phosphate                     ≤0.001%
硅酸鹽（以SiO2計(jì))Silica                  ≤0.005%
硫化合物(以SO4計(jì))Sulfur compounds        ≤0.003%
重金屬(以Pb計(jì))Heavy metals               ≤5ppm
鐵(Fe)Iron                               ≤5ppm
鈣(Ca)Calcium                            ≤0.03%
鎂(Mg)Magnesium                          ≤0.005%
鉀(K)Potassium                           ≤0.005%

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