Method for measuring concentration of total hardness Na2EDTA standard solution

Abstract

The invention discloses a method for measuring the concentration of a total hardness Na2EDTA standard solution. According to the technical scheme, the method comprises: adopting an inductively coupled plasma emission spectrometer for measuring the sodium element of a diluted to-be-measured sample and a diluted blank sample; diluting the sodium element standard solutions step by step to prepare a plurality of series of sodium element standard solutions with different concentrations, and carrying out Na element determination on the sodium element standard solutions with different gradients to obtain the emission intensity of the sodium element in the sodium element standard solutions with different concentrations; formulating a sodium element standard curve according to the determination result of the Na element in the sodium element standard solution with each concentration; and determining the concentration of the Na2EDTA standard solution according to the standard curve and the Na element determination results of the sample to be detected and the blank sample. The determination method provided by the invention has the advantages of fast response time, fast test speed and high accuracy, can fundamentally solve the problem of time consumption, improves the accuracy rate and fast test speed, and can be popularized, promoted and applied.

Description

technical field [0001] The invention belongs to the technical field of chemistry, in particular to a method for measuring total hardness Na 2 EDTA standard solution concentration method. Background technique [0002] The total hardness of water refers to the concentration of calcium and magnesium ions in the water. Through testing, it can be known whether it can be used in industrial production, and the total hardness of daily life has a great influence on industrial water. Hard water has a major impact on human health and industrial water use, hard water is not suitable for industrial use, this type of water scales after heating in boilers, reduces heat transfer in boilers and consumes a lot of fuel. During the dyeing process, some fuels will be deposited by hard water, or the luster of colored objects will be deteriorated, which will affect the quality of the product. When washing clothes and towels in hard water, soap is often used, and soapy water can form deposits. ...

AI Technical Summary

Problems solved by technology

The disadvantage of the above method is that zinc has many steps in the process of weighing, dissolving, heating and transferring, resulting in content loss, the calculated zinc standard solution concentration is low, and then the zinc standard solution is used to calibrate Na 2 EDTA results will be high, and the process has many steps, which is cumbersome and time-consuming

[0004] Publication number is that the Chinese patent of CN111948336A proposes a kind of total hardness measurement Na 2 EDTA calibration method, use total hardness quality control sample or standard solution instead of zinc standard solution for Na 2 EDTA for calibration. Although this method solves the problem of large deviations in the measurement results caused by the loss of zinc content, the concentration of the total hardness quality control sample used in the measurement process of this method is within a range, and the calibrated Na 2 EDTA concentration is also a range, not a definite value, and there are still flaws in accuracy

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