Determination Of Arsine Research Articles

ChemInform Abstract: Selective Determination of Trace Arsenic and Antimony Species in Natural Waters by Gas Chromatography with a Photoionization Detector.

Traces amounts of arsenic and antimony in water samples were determined by gas chromatography with a photoionization detector after liquidnitrogen cold trapping of their hydrides. The sample solution was treated with sodium hydroborate (NaBH4) under weak-acid conditions for arsenic(III) and antimony(III) determination, and under strong-acid conditions for arsenic(III+V) and antimony(III+V) determination. Large amounts of carbon dioxide (CO2) and water vapor obscured determination of arsine and stibine. Better separation from interference could be achieved by removing CO2 and water vapor in two tubes containing sodium hydroxide pellets and calcium chloride, respectively. The detection limits of this method were 1.8 ng dm−3 for arsenic and 9.4 ng dm−3 for antimony in the case of 100-cm3 sample volumes. Therefore, it is suitable for determination of trace arsenic and antimony in natural waters.

Speciation of arsenic in the atmosphere

In this paper is presented a study of speciation of arsenic in air, consisting in the separation and determination of arsine, metallic arsenic, inorganic trivalent and pentavalent arsenic, organic monomethylarsonic acid (MMA), dimethylarsinic acid (DMA) and/or their salts. These arsenic compounds are the most common found in air and are characterised by different toxicities. The proposed procedure is based on a sequential sampling where, first, the air is filtered on a cellulose membrane to collect the particulate matter, then it is purged into proper solutions able to stop the arsenic species present in the vapour state, except arsine. This latter compound is retained in an oxidising solution of permanganate as arsenate. The determination of the different species of arsenic in the particulate and in the vapour phase is described as well the typical interferences that can be encountered either in the solubilization procedure or in the analytical measurements: in many cases suggestions are proposed in orde...

Determination of Arsine in Coal-Derived Gas at Parts-Per-Billion Levels

Determination par chromatographie en phase gazeuse de concentrations faibles (en parties par milliard) de AsH 3 dans un gaz derive du charbon causant des degats dans les piles a combustible a carbonate fondu

Polarographic determination of arsine in gaseous mixtures (in German).

Polarographic determination of arsine in gaseous mixtures (in German).