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Method for determining content of calcium and magnesium ions in industrial circulating water

A technology of industrial circulating water and calcium and magnesium ions, which is applied in the field of analysis, can solve the problems of cumbersome pretreatment, etc., and achieve the effects of improving chromatographic peak overlap, accurate method, and narrowing spectral band

Inactive Publication Date: 2021-03-26
SHAANXI RES DESIGN INST OF PETROLEUM CHEM IND
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For unknown water samples, the pretreatment is cumbersome, and the dilution factor needs to be tried continuously. Only by selecting a suitable dilution factor can the peaks of the two components be completely separated.

Method used

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  • Method for determining content of calcium and magnesium ions in industrial circulating water
  • Method for determining content of calcium and magnesium ions in industrial circulating water
  • Method for determining content of calcium and magnesium ions in industrial circulating water

Examples

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Embodiment 1

[0015] 1. Add 0.0, 1.25, 2.5, 5.0, and 10mL of calcium ion standard solution with a concentration of 1000mg / L to five 25mL colorimetric tubes, and then add 0.0, 1.25, and 2.5mL of a magnesium ion standard solution with a concentration of 1000mg / L respectively. , 5.0, 10mL, dilute to volume with distilled water and shake well. Adopt ion chromatograph under ion chromatographic conditions: column pressure 11.0MPa, column temperature 45 ℃, flow velocity 1.5mL / min, sample volume 20 μ L conditions, determine the ion chromatogram of solution (such as figure 1 Shown), the obtained ion chromatogram is carried out to the first order derivative processing, with the obtained spectrogram after the first order derivative processing (such as figure 2 Shown) the first derivative value dσ of calcium ion corresponding to the retention time of magnesium ion in 钙 / dt 钙 Plotted against the corresponding calcium ion concentration, draw dσ 钙 / dt 钙 With the calcium ion concentration (C 钙 ) chan...

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Abstract

The invention discloses a method for determining the content of calcium and magnesium ions in industrial circulating water. The method comprises the following steps: determining a standard working solution by using an ion chromatograph to obtain an ion chromatogram, and carrying out first-order derivative treatment on the obtained ion chromatogram, drawing a graph according to a first-order derivative value d sigma calcium / dt calcium of the calcium ions corresponding to the magnesium ion retention time in the spectrogram obtained after the first-order derivative treatment and the correspondingcalcium ion concentration, and drawing a standard curve that d sigma calcium / dt calcium changes along with the calcium ion concentration; and similarly, drawing a standard curve of the magnesium ions. According to the method, a water sample does not need to be treated before measurement, ion chromatographic peak stacking and derivative treatment technologies are combined, a spectral band is narrowed, the peak shape is optimized, chromatographic peak stacking is improved, mutual interference between calcium and magnesium ion peaks is avoided, so that the content of calcium and magnesium ions in water is accurately measured.

Description

technical field [0001] The invention belongs to the technical field of analysis, and in particular relates to a method for determining the content of calcium and magnesium ions in industrial circulating water. Background technique [0002] The titration method is generally used for the determination of calcium and magnesium ions in industrial circulating water, but the preparation of solutions by titration method is cumbersome and has many steps. The prior art also has reports to adopt ion chromatography to measure the content of calcium and magnesium ions in industrial circulating water, but when measuring samples, because the retention time of calcium and magnesium ions is close, when the ion content is high, the chromatographic peaks of the two partially overlap and overlap with each other. mutual interference measurement. For industrial circulating water, due to the continuous evaporation of water, the salts are concentrated, and the content of calcium and magnesium ion...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/96G01N30/86G01N33/18
CPCG01N30/96G01N30/861G01N33/1813
Inventor 王玲燕张国辉王丽莉胡静李珍
Owner SHAANXI RES DESIGN INST OF PETROLEUM CHEM IND