GB /T 1266-86     
项目Item                                               优级纯            分析纯                 化学纯   
                                                                 (GR)               (AR)                    (CP)
含量(NaCl)Assay,%                                      ≥ 99.8          99.5                    99.5 
                                                                 ≤ 0.001        0.002                  0.005   
钾(K)Pitassium,%                                        ≤ 0.01           0.02                   0.04     
钙(Ca)Calcium,%                                         ≤ 0.002         0.005                 0.01     
亚铁氰化物(以Fe(CN)6计)Ferrocyanide,% 
                                                                 ≤ 0.0001      0.0001                -- 
铁(Fe)Iron,%                                               ≤ 0.0001      0.0002              0.0005  
砷(As)Arsenic,%                                         ≤ 0.00002     0.00005          0.0001  
钡(Ba)Barium,%                                         ≤ 0.001          0.001                0.001    
重金属(以Pb计)Heavy metals,%     
                                                                ≤ 0.0005         0.0005             0.001    
水溶液反应water Solution reaction 
                                                                合格                   合格                合格 
澄清度试验Clarty                                        合格                   合格                合格  
水不溶物Insiluble matter in water,%   
                                                              ≤ 0.003              0.005            0.02     
干燥失重Drying loss,%                             ≤ 0.2                   0.5                0.5
碘化物(I)Iodide,%                                   ≤ 0.001               0.002           0.012      
溴化物(Br)Bromide,%                               ≤ 0.005                0.01             0.05    
硫酸盐(SO4)Sulfate,%                              ≤ 0.001                0.002           0.005    
磷酸盐(PO4)Phosphate,%                         ≤ 0.0005              0.001            --    
氮化合物(N)Nitrogen,%                            ≤ 0.0005              0.001        0.003   
镁(Mg)Magnesium compounds,%      

ACS级
项目名称　                                                    ACS Grade
含量Assay                                                      ≥ 99.0%
钡(Ba)Barium(Ba)                                            Passes test
重金属(以Pb计)Heavy metals(as Pb)                  ≤5ppm
铁(Fe)Iron                                                     ≤2ppm
钙(Ca)Calcium                                                ≤0.002%
镁(Mg)Magnesium                                          ≤0.001%
钾(K)Potassium                                              ≤0.005%
pH(5%溶液,25.0℃)pH of a 5% solution at 25.0℃ 5.0-9.0
水不溶物Insoluble matter                                 ≤ 0.005%
碘化物(I)Iodide(I)                                            ≤ 0.002%
溴化物(Br)Bromide(Br)                                     ≤ 0.01%
氯化物和硝酸盐(以NO3计)
Chloride and Nitrate                                        ≤ 0.003%
磷酸盐(PO4)Phosphate                                    ≤ 5ppm
硫酸盐(SO4)Sulfate                                         ≤0.004%

基准试剂PT
纯度Assay                             　                 　99.95-100.05%

项目                                                         分子生物学级     
                                                                 (for molecular biology )
外观Appearance                                   白色结晶粉末
痕量分析Trace analysis :
碘I                                                            < 20 PPM
磷酸根PO4                                                 < 5 PPM
硫酸根SO4                                                 < 4 PPM
钙Ca                                                         < 50 PPM
铁Fe                                                          < 2 PPM
镁Mg                                                         < 50 PPM
钾K                                                            < 50 PPM
纯度Purity                                                  >99.85 %  (银量法)
重金属Heavy metals (as Pb)                         <5 ppm
DNA酶、RNA酶、蛋白酶等Dnase,Rnase,Protease  未检测到
紫外吸光度UV (0.1 M 水溶液)
260 nm A:                                                <0.01
280 nm A:                                                <0.01