邻苯二甲酸氢钾,基准试剂

4.120162
Potassium Hydrogen Phthalate, primary standard 
ACS-ISO
C8H5KO4          M.=204.22
CAS No.          877-24-7

Assay (Acidim.)                                  99.95 ~ 100.05%
pH (0.05 mol/l in H2O, at 25± 0.2℃)            4.00 ~ 4.02
Insoluble matter in H2O                          ≤ 0.003%
Cl compounds (as Cl)                             ≤ 0.003%
Nitrogen compounds (as N)                        ≤ 0.001%
Sulphur compounds (as S)                         ≤ 0.002%
Chloride (Cl)                                    ≤ 0.002%
Heavy metals (as Pb)                             ≤ 0.0005%
Ca ≤ 0.001%   Mg ≤ 0.001%
Cd ≤ 0.0005%  Mn ≤ 0.0005%
Co ≤ 0.0005%  Na ≤ 0.005%
Cr ≤ 0.001%   Ni ≤ 0.0005%
Cu ≤ 0.0005%  Pb ≤ 0.0005%
Fe ≤ 0.0005%  Zn ≤ 0.0005%