Method for detecting calcium carbonate residue after cleaning of calcium preparation production line

Abstract

The invention provides a method for detecting calcium carbonate residue after cleaning of a calcium preparation production line, which is simple and convenient to operate and accurate in data. The method comprises the following steps: (1), taking more than two cotton swabs, pressing the cotton swabs on a cup wall after being wetted by wiping solution, so that the cotton swabs do not have any water stop and have proper humidity, and then, respectively wiping the surface of equipment; (2), preparing test solution; (3), preparing standard calcium solution as reference solution according to the allowable calcium residue standard concentration; (4), atomizing calcium ion in the test solution and the reference solution through a flame atomizer, and, according to characteristic absorption of calcium atom at the wavelength of 422.7 nm, determining the concentrations of calcium in the test solution and the reference solution according to the absorbancy; and (5), comparing the absorbancy of the test solution with the absorbancy of the reference solution. The method for detecting calcium carbonate residue after cleaning of the calcium preparation production line disclosed by the invention is simple and convenient to operate, accurate in data and not subjected to human factor; particularly, the method is high in detection accuracy and sensitivity for trace analysis.

Description

technical field [0001] The invention relates to a cleaning inspection method for a calcium preparation production line, in particular to a calcium carbonate residual inspection method after the calcium preparation production line is cleaned. Background technique [0002] Calcium content is generally determined by EDTA volumetric method, the principle is to use EDTA to ionize to generate H 2 Y 2- It is complexed with calcium ions to form stable colorless compounds, and the metal ion indicator is used to indicate the end point of the titration, and the calcium content is calculated. [0003] This method has certain requirements for the selection of metal indicators, and most of the metal indicators are organic acids, and the color changes with the pH value. Therefore, it is necessary to control the appropriate pH value range during titration, which brings certain difficulties to the actual measurement. The titration operation is based on the visual observation of the equival...

AI Technical Summary

Problems solved by technology

The titration analysis method is limited by the minimum detection concentration. For the residual calcium after the production line is cleaned, trace analysis and detection are difficult, and accurate data cannot be issued.

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