Rapid analysis of volatile arsenic species released from lake sediment by a packed cotton column coupled with atomic fluorescence spectrometry

Abstract

It is very important to qualify and quantify volatile arsenic species produced by sediment in order to further understand transformation and transportation of arsenic. Effective separation and sensitive detection of various volatile arsenic species are definitely the key steps for that. In this paper, a short packed cotton column was found effective to separate volatile arsenicals (AsH 3 , CH 3 AsH 2 , (CH 3 ) 2 AsH and (CH 3 ) 3 As) rapidly. Based on this, a new online system for collection and speciation of volatile arsenic species was developed. After successful separation on a cotton column, volatile arsenic species were sensitively detected by atomic fluorescence spectrometry (AFS). A special PTFE chamber was designed and applied for both incubation and collection of volatile arsenicals generated from sediment online. Minor amounts of volatile arsenicals produced from sediment in headspace were sensitively measured. Real sample analysis and a spiking experiment indicated that the established system was sensitive and practical for the analysis of volatile arsenicals produced in the environment. It will be a very useful tool for further understanding the transformation of arsenic in the environment with low instrumental costs and running fees.

Rapid catalytic oxidation of arsenite to arsenate in an iron(III)/sulfite system under visible light

“…HCl-1.5% KBH4 solution, and As(T) was determined by using 1% thiourea (m V −1 )-1% ascorbic acid (m V −1 ) and 5% HCl-2% KBH4 solutions. Prior to As(T) determination by HG-AFS, thiourea and ascorbic acid were used to reduce As(V) to As(III) [37], then KBH4 and HCl were used for hydrogenating As(III) to AsH3 [38]. Fe(II) concentration was determined by spectrophotometry (Shimadzu UV-1601) at 510 nm using 1,10 phenanthroline method [36].…”

Green synthesis of surface-passivated carbon dots from the prickly pear cactus as a fluorescent probe for the dual detection of arsenic(iii) and hypochlorite ions from drinking water

“…Trace levels of As 3+ ions have been quantitatively detected by inductively coupled plasma mass spectroscopy (ICP-MS), inductively coupled plasma atomic emission spectrometry (ICP-AES), atomic uorescence spectrometry (AFS), and atomic absorption spectrometry (AAS). [21][22][23][24][25] The common analytical methods used for the accurate detection of As 3+ /ClO À ions are chemosensors, biosensors, and iodometric and polarographic methods. [26][27][28][29][30][31][32][33][34] Though these techniques are very qualitative and quantitative, yet they are limited to expensive instrumentation, inconvenient analytical methods, tedious material preparation procedures, and are time consuming.…”

Bifunctional magnesium oxide crystal successively as adsorbent and matrix modifier for preconcentration and determination of arsenic by graphite furnace atomic absorption spectrometry

“…However, the As(III) is unstable and rapidly converted to As(V) under ambient conditions [15]. The common methods for As(V) detection are atomic spectrometry methods, such as graphite furnace/electrothermal atomic absorption spectrometry (GFAAS/ETAAS) [16][17][18], hydride generation atomic fluorescence spectrometry (HGAFS) [19][20][21][22][23] and inductively coupled plasma mass spectrometry (ICPMS) [24][25][26]. The ICPMS provides the best sensitivity and accuracy among all the commercial detectors, but its high price and maintenance cost is still unaffordable for routing analysis in the developing countries and areas [10,11,27,28].…”