Patent
Method of analyzing gold electroplating solutions for arsenic(III)
TLDR
In this paper, ammonium pyrrolidine dithiocarbamate is added as a complexing agent for the AsO2 -1 ion in an electroplating solution.Abstract:
A method of analyzing for As(III) as AsO2 -1 ion in an Au(I) containing electroplating solution. The concentration of As(III) in the electroplating solution is maintained high enough to avoid formation of "burnt Au" oxides but low enough to avoid bond failures. A sample of the electroplating solution is withdrawn and added to a buffered solution, for example an acetate-ethylene diamine tetraacetic acid (EDTA) buffered solution. A complexing agent for Au(I) ion is added to the buffered solution. This can be an alkali metal cyanide. Next ammonium pyrrolidine dithiocarbamate is added as a complexing agent for the AsO2 -1 ion. The ammonium pyrrolidine dithiocarbamate--AsO2 -1 ion is extracted, for example with methyl isobutyl ketone (MIBK). The extract is analyzed for As(III) by atomic absorption, as electrothermal atomic absorption spectrometry.read more
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Patent
Measuring method of arsenic content of glyceryl triacetate
TL;DR: In this article, a measuring method of the arsenic content of glyceryl triacetate is presented, which is characterized by comprising of diluting a sample by utilizing absolute ethyl alcohol in the pretreatment stage, carrying out a standard addition method, and adding an air oxidation procedure between the drying procedure and the ashing procedure of a temperature programming of an atomic absorption spectrometer.
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Journal ArticleDOI
Determination of arsenic(III), arsenic(V), antimony(III), antimony(V), selenium(IV) and selenium(VI) by extraction with ammonium pyrrolidinedithiocarbamate—methyl isobutyl ketone and electrothermal atomic absorption spectrometry
TL;DR: In this article, the solution conditions and other parameters affecting the ammonium pyrrolidine-dithiocarbamate-methyl isobutyl ketone extraction system for graphite-furnace atomic absorption spectrometric determination of As(III), As(V), Sb(III) and Se(IV) were studied in detail.
Journal ArticleDOI
Selective determination of arsenic(III) and arsenic(V) with ammonium pyrrolidinedithiocarbamate, sodium diethyldithiocarbamate and dithizone by means of flameless atomic-absorption spectrophotometry with a carbon-tube atomizer.
TL;DR: The proposed methods are applied satisfactorily for determination of As(III) and As(V) in various types of water.
Patent
Low stress electrodeposition of gold for X-ray mask fabrication
TL;DR: In this paper, an electrodeposition process for producing gold masks for X-ray lithography of integrated circuits is described, which produces a gold layer of tightly controlled grain size and arsenic content which results in minimum stress in the gold film and therefore minimum distortion in the features produced from the mask.
Patent
Method of selectively depositing a metal on a surface of a substrate
TL;DR: In this article, a method of selectively depositing a metal on a surface of a substrate is disclosed, where a suitable substrate is selected and a catalytic species is deposited on the surface thereof.
Patent
Method for measuring and adjusting concentration of plating solution and concentration adjusting device
TL;DR: In this article, the reducing agent is measured using a measuring device provided with fixed delivery pumps 3 and 4, a sixway valve 5, a sampling loop 6, a sample injection port 36, an anion exchanger 7, an ion-exchange membrane 8, an UV absorption detector 9 and a recorder 37.