Method for detecting barium and zinc in zinc-barium liquid compound stabilizer

Abstract

The invention discloses a method for detecting barium and zinc in a zinc-barium liquid compound stabilizer. The method comprises the following steps: (1) dissolving a zinc-barium liquid compound stabilizer sample by using 120# solvent gasoline, wherein the ratio of the sample quality to the solvent gasoline volume is 1:(10-15) (g / ml); adding absolute ethyl alcohol to metered volume, wherein the metered volume is V, and shaking to be even; (2) transferring two parts of solutions with the same volume prepared in the step (1), adding ammonium fluoride and water to one part of solution to dissolve ammonium fluoride, and then adding an ammonia-ammonium chloride buffer solution of which the pH is 10; adding a plurality of drops of eriochrome black T indicators, carrying out titration by using an ethylene diamine tetraacetic acid (EDTA) standard titration solution until the titration end point of which the solution becomes pure blue; recording the volume V1 of consumed EDTA standard titration solution, calculating the content of zinc in the sample; not adding ammonium fluoride to the other part of solution, and carrying out the same treatment processes; recording the volume V2 of the consumed EDTA standard titration solution, and calculating according to the formula 2, so as to obtain the content of barium in the sample. The method is simple in apparatus, and accurate and reliable in result, and the content of zinc and barium can be respectively determined.

Description

technical field [0001] The invention relates to a detection method, in particular to a detection method of barium and zinc in a liquid barium-zinc composite stabilizer. Background technique [0002] Liquid barium-zinc composite stabilizer is widely used in adhesive tapes, plastics, chemicals and other fields because it is clean and environmentally friendly, easy to measure, and has no dust pollution during production and application. [0003] At present, the test method for metals in liquid barium-zinc composite stabilizer is as follows: Weigh (0.2-0.3) g (accurate to 0.0001 g) sample, place it in a 250ml Erlenmeyer flask, and use 5mlNY-200 solvent oil (A.1.5) After dilution (heating in a water bath if necessary), add (30-50) ml of ethanol (A.1.4) and shake well, then accurately add 10 ml of EDTA standard titration solution (0.05mol / L) and shake well, then add 10 ml of ammonia buffer solution (PH = 10), add a small amount of chrome black T indicator (0.5%) and titrate with ...

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Problems solved by technology

[0015] (3) The titration method is the back titration method, which has a large error compared with the direct titration method

[0016] And for liquid barium-zinc composite stabilizer, its barium content should be controlled at 5.1-6.0%, zinc content should be controlled at 1.1-1.6%, so both content must all be detected, generally adopt atomic absorption spectrophotometry in the prior art , but atomic absorption spectrophotometers are generally expensive, which is not conducive to the popularization and use of inspection methods

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