Determination of organic acid anions and inorganic ions in the crystalloid salt on pottery cultural relics by dual channel ion chromatography
The contents of 9 anions and 6 cations in the crystalloid salt on ancient pottery,such as CH3 COO-,HCOO-,F-,Cl-,SO2-4,NO-3,Na+,K+,NH4 +,Ca2+,Mg2+,were studied and determined by dual channel ion chromatography.Using Metrosep A Supp7 anion chromatographic column as the ana-lytical column,3 mmol/L NaCO3 as the eluent,the flow rate was 0.7 mL/min,using Metrosep C4 cations chromatographic column as the analytical column,0.8 mmol/L C7 H5 NO4-1.6 mmol/L HNO3 as the elu-ent,the flow rate was 0.7 mL/min.Under this method,the purified filtrate is measured by conductivity detector.Each ion formes a good,moderate separation.The detection limit was between 0.005～0.05 mg/L.The correlation coefficient(R)of the various ions in samples was greater than 0.999,it has a good linear relationship,the recovery was 96%～106%,and the relative standard deviation was 0.1%～4%(n = 5).The result showed that the crystal salt on the tile surface mainly contains:Ca2+,Na+,CH3 COO-,Cl-,SO2-4,NO-3.The method is fast and accurate,sensitive and reliable and can be used for the separation and determanation of common organic acid ions and inorganic ions in crystal salts on the surface of cultural relics.
cultural relicscrystallized saltion chromatographyorganic acid anions
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