Preparation method of dicofol standard solution

Abstract

The invention belongs to the technical field of standard solutions, and particularly relates to a preparation method of a dicofol standard solution, which comprises the following steps: calculating the amount of the required standard substance dicofol and the amount of the required solvent n-hexane according to the determined concentration C0 and volume V0 of the dicofol standard solution, and weighing the dicofol; then dissolving with methylbenzene, and then adding normal hexane to a constant volume to obtain a normal hexane solution of dicofol; determining the concentration value of the dicofol in the solution, performing parallel determination for three times, taking the average value C1 of the concentrations, and taking the C1 in the measurement uncertainty range as the detection concentration of the dicofol standard solution, wherein the normal hexane solution of the dicofol in accordance with the measurement uncertainty range is the dicofol standard solution. By adding methylbenzene, the stability of the dicofol solution standard substance is better, and the problem that the dicofol solution standard substance in normal hexane is unstable in the placement process is solved.

Description

technical field [0001] The invention belongs to the technical field of standard solutions, and in particular relates to a preparation method of a dicofol standard solution. Background technique [0002] At present, the product is prepared according to the preparation method of the standard solution stipulated in SN / T 0348.1-2010 "Guidelines for Standard Sample Work", but because the national standard method is a normative document, there is no detailed operation for specific substances Note that due to the wide variety of chemical properties, the concentrations of the produced standard solutions have significant differences. [0003] For the preparation of dicofol solution standard substance in n-hexane, on the one hand, it is necessary to ensure that the prepared standard solution is closer to the theoretical value; on the other hand, due to the unstable standard substance of dicofol solution in n-hexane, the presence of There are large errors in the calibration of other r...

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Problems solved by technology

[0005] In order to solve the problem of instability of the standard solution in the preparation of dicofol standard solution in n-hexane in the prior art, the present invention provides a preparation method of dicofol standard solution, in which toluene is added during the preparation process to improve the stability of dicofol It makes the concentration value of the prepared dicofol standard solution closer to the theoretical value, and at the same time solves the problem of impurities generated during the placement of the standard substance of the dicofol solution in n-hexane, prolonging the validity period of the standard solution

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