SU1589159A1 - Method of determining brightening addition - Google Patents

Abstract

This invention relates to analytical chemistry, and specifically to methods for determining bright-forming additives in a copper plating electrolyte. The aim of the invention is to increase the sensitivity of the assay. A mixture of chloroform and isopropyl alcohol in a ratio of 10: (0.8-1.2) is added to the sample as an extractant. The mixture is then shaken for 3 minutes and photometric. 1 tab.

Description

t.

(21) 4456688 / 31-25

(22) 08.07.88 (46) 08.30.90. Bksh. Number 32

(71) Leningrad Mining Institute. G.V.Plekhanova

(72) V.L.Parkhomovsky, A.E.Gorshtyuin, I.V.Timofeeva, E.V., Belykh

and M, Z. Weinstein

(53) 535.24 (088.8)

(56) Patent of France No. 2566535,

cl. G 01 N 27/46, 1985.

Parkhomovsky V.L., Petrov M.A. Determination of organic flotation reagents in wastewater from enrichment plants.

(54) METHOD FOR DETERMINING GLOSSY SUPPLEMENT

(57) The invention relates to analytical chemistry, in particular, to methods for the determination of brilliant-forming additives in the electrolyte of copper printed circuit boards. The aim of the invention is to increase the sensitivity of the assay. A mixture of chloroform and isopropyl alcohol in a ratio of 10: (0.8-1.2) is added to the sample as an extractant. The mixture is then shaken for 3 minutes and frithometrized. 1 tab.

This invention relates to analytical chemistry, in particular, to methods for determining the content of a brightening agent (formative agent) in a copper-plating electrolyte.

The purpose of the invention is to increase the sensitivity of the method for determining the gloss-forming additive in the copper-plating electrolyte of printed circuit boards.

The method is carried out as follows.

10 ml of chloroform and isopropyl alcohol are added to the analyzed sample of copper plating electrolyte with a volume of 100 ml based on a ratio of 10: (O, 8-1.2). After that, the mixture is shaken for 3 minutes. The extract is poured into a cuvette with a width of 10 mm and its optical density is measured on a photocolorimeter at D 590 nm by a differential method. Content

I

brilliance additives are on the calibration schedule.

When the additive is added to the electrolyte solution, smooth, shiny coatings are obtained, characterized by high ductility and low internal stresses. To ensure the proper operation of the baths and to improve the quality of the printed circuit boards produced, constant control of the concentration of the additive is necessary.

I

In terms of their chemical composition, various gloss-forming additives consist of different ratios of surface-active compounds from the class of non-ionic fields of alkylene glycols,

disodium salt 4,4-dithiobenzo-sulfonic acid and dye from the triphenylmethane class (additives LTI, MPP-G, BS).

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The table shows the analyzes of electrolit copper plating of printed circuit boards containing various brilliant-forming additives.

Claims (1)

The use of the proposed method will allow controlling contaminated waste electrolytes with a sensitivity of 0.6-1.0 ml / l, which will ensure a social effect - environmental protection. The method of determining the gloss-forming additive in the copper plating electrolyte of printed circuit boards, including electrolyte sampling, extraction of the additive and photometric measurement, characterized in that, in order to increase sensitivity, extraction is carried out using a mixture of chloroform and isopropyl alcohol as an extractant in a ratio of 10: (0 8-1,2).