Sample processing method for detecting calcium content in lithium

Abstract

The embodiment of the invention discloses a sample processing method for detecting calcium content in lithium, comprising the following steps of: taking A milligrams of lithium sample, removing oxide layer from the surface of the sample and instantly placing in water, completely dissolving and cooling to obtain a first sample solution; transferring m milliliters of the first sample solution to a second beaker; dropping phenolphthalein ethanol solution into the second beaker in order to develop the first sample solution into red; titrating the red solution in the second beaker to colorless state by acid standard solution to obtain a second sample solution; recording the volume of the acid standard solution consumed by the second sample solution; calculating the volume V of the first solution to be transferred when B milligrams of lithium sample are needed, transferring V milliliters of the first sample solution to a volumetric flask; diluting the first sample solution to the graduation of the volumetric flask by ultrapure water, and mixing to obtain a measuring sample solution. The measuring sample solution is obtained by the technical method provided by the invention, and by processing the sample with the methods for chemical quantitative analysis, the detection accuracy of calcium content in lithium is greatly improved.

Description

technical field [0001] The invention relates to the field of chemistry, in particular to a sample processing method for determining the calcium content of lithium. Background technique [0002] The chemical analysis method needs to process the bulk metal into chips, and accurately weigh its mass. When analyzing the calcium content in refined lithium, due to the chemical nature of lithium, it is easy to oxidize in the air, so it cannot be directly processed in the air. The sample and the processed sample are weighed. The traditional method of weighing lithium is: first weigh the quality a of a clean and dry weighing bottle, and place the balance in a glove box filled with argon. Cut an appropriate amount of lithium sample in the glove box and place it in the above-mentioned weighing bottle, then weigh the mass b of the weighing bottle containing the lithium sample on the balance, and the difference between mass a and mass b is the weight of the lithium sample. quality. [0...

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Problems solved by technology

[0003] The above-mentioned weighing method has the following disadvantages: 1. More materials need to be prepared for weighing, such as: glove box, balance, argon gas, etc.; 2. If the argon gas in the glove box is insufficient or there is oxygen, the surface of the lithium sample It will be oxidized into lithium oxide, which will cause inaccurate weighing of the sample amount and affect the analysis results

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