GB/T 39305-2020Reclaimed water quality - Determination of fluoride,chloride,nitrite,nitrate,sulfate - Ion chromatography (English PDF)

4.1

In ion chromatography, when the concentration of a component in the sample is very high, the chromatogram will correspond to peak broadening, which masks the effects of other components.

Peaks, causing interference. This interference can usually be reduced by appropriately diluting the sample according to the concentration of other anions; or separating dry

The method of disturbing ions reduces interference.

4.2

Due to the complex composition of reclaimed water, some organic matter, especially organic matter containing benzene ring, permanently adsorbs the resin of the separation column, making the separation

The adsorption capacity of the column is reduced, and the column is damaged, which interferes with the measurement. Usually a pretreatment column is used for treatment.

4.3

Since the conductivity of water is lower than that of the eluent, the water in the sample will produce a negative peak in the chromatogram during the elution, see

Appendix A eliminates water negative peaks.

5.1

Unless otherwise specified, the reagents and water used in this standard shall be degassed using superior grade pure reagents and complying with the requirements of GB/T 33087 deal with.

Note. The purity of water and reagents affects the detection limit of the method. It is recommended to prepare a standard solution with freshly prepared water.

5.2 Eluent

Prepare according to the instrument model and chromatographic column instructions.

5.3 Regeneration fluid

prepare according to the suppressor model and instruction manual.