Underestimation of the total arsenic concentration by hydride generation techniques as a consequence of the incomplete mineralization of arsenobetaine in acid digestion procedures

Šlejkovec, Zdenka; Elteren, Johannes T. van; Woroniecka, Urszula D

doi:10.1016/s0003-2670(01)01223-5

Cited by 48 publications

(16 citation statements)

References 6 publications

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“…Since we have not investigated the necessity of inclusion of HClO 4 in the acid combination, which is controversial, 12,18 further study is needed to clarify its necessity if we consider Sample (n = 6) Method Mean total As/µg g…”

Section: Discussionmentioning

confidence: 99%

Decomposition of organoarsenic compounds for total arsenic determination in marine organisms by the hydride generation technique

Narukawa

Kuroiwa

Inagaki

et al. 2005

Appl. Organometal. Chem.

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The conditions necessary for the complete decomposition of six organic arsenic compounds, namely methylarsonic acid (MMAA), dimethylarsinic acid (DMAA), trimethylarsine oxide, tetramethylarsonium iodide, arsenocholine bromide (AsC) and arsenobetaine (AB), were investigated. The degree of decomposition of the arsenic compounds was monitored using a hydride generation (HYD) technique, because the response from this system depends strongly on the chemical species of arsenic, with inorganic arsenic (the expected product from these decomposition experiments) giving a much more intense HYD signal than the organic arsenic compounds. The arsenic compounds were decomposed by heating them with three types of acid mixture, namely HNO 3 -HClO 4 , HNO 3 -HClO 4 -HF, or HNO 3 -HClO 4 -H 2 SO 4 . Both MMAA and DMAA were decomposed completely using any of the mixed acids at a decomposition temperature of 200 • C or higher. The HNO 3 -HClO 4 -H 2 SO 4 mixture was the most effective for decomposing AsC and AB, which are the most difficult compounds among all types of organic arsenic compound to decompose and render inorganic. The complete decomposition of AB was only achieved, however, when the temperature was 320 • C or higher, and the sample was evaporated to dryness. When the residue from this treatment was examined by high-performance liquid chromatography combined with inductively coupled plasma atomic emission spectrometry, all of the arsenic was found to be present as arsenic(V). The optimized conditions (HNO 3 -HClO 4 -H 2 SO 4 at 320 • C) for decomposing AB were then used to determine the total amount of arsenic in marine organisms known to contain AB.

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Section: Discussionmentioning

confidence: 99%

Decomposition of organoarsenic compounds for total arsenic determination in marine organisms by the hydride generation technique

Narukawa

Kuroiwa

Inagaki

et al. 2005

Appl. Organometal. Chem.

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“…Some organic As compounds probably present in sediment sample in large quantities, like aresnocholine (AsC) or arsenobetaine (AsB), do not form hydrides with NaBH 4 whereas inorganic As forms, both As(III) and As(V), are converted into their respective arsines. In this way, inorganic As gives the highest arsine yield and consequently the highest detector response [25,26].…”

Section: Determination By Aasmentioning

confidence: 99%

Determination of As in environmental solid matrix

2002

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In line with recent European environmental guidelines on biomasses, one of the most important parameters to take into account is the As concentration, especially when present in biomasses and complex matrices. The goal of the present study is to give information about possible technical-analytical problems during the determinations of such elements by means of different instrumental spectroscopy techniques, in particular inductively coupled plasma atomic emission (ICP-AES) and atomic absorption (AAS), using two different wavelengths, 188.98 nm and 193.70 nm. In the Laboratory of Hygiene of National Institute of Health in Italy, a specific study has been carried out concerning the determination of As contents in environmental solid matrices, using as reference material BCR 141 R, represented by a calcareous soil. In particular, whereas recovery tests did not show particular drawbacks, difficulties were met in the As detection in reference material. Spectral interference was seen during determination by ICP-AES and matrix interference during determination by AAS, in particular using ETAAS with deuterium background correction and HAAS. Using ETAAS with Zeeman background correction at 193.70 nm, the As line did not show particular matrix interference during the reading of samples.A ring test involving two more laboratories and another certified reference material (IAEA-356 in marine sediment matrix) produced important information about problems of under/over estimation of data. Two different instrumental techniques, ICP-MS and HAAS, confirmed previous data, i.e., overestimation for inductively coupled plasma mass spectrometry and that As values achieved by HAAS were of the same order as the references, but affected by considerable standard deviation. In the light of this study, data achieved on the environmental matrices investigated suggest that the critical step in As determination is the instrumental reading, rather than the mineralization process. Further, each of the methods proposed, apart from ETAAS with Zeeman background correction, presents its own peculiar drawbacks and no particular advantage over other techniques.

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“…HG-AFS detector is simple and not expensive to use. It allows determination of As(III), As(V), MMAA, DMAA and also AsB, AsC after sample digestion with microwave source or UV irradiation (Slejkovec et al, 1998(Slejkovec et al, , 2001) on sub-micrograms per liter detection limit in environmental samples (Featherstone et al, 2000;Mester et al, 1996;Slejkovec et al, 1998;Vilano et al, 2000). Absolute DL of this method, using IP-RP chromatography: As(III) = 2.5, As(V) = 4.5, MMAA = 2.0, DMAA = 2.9 ngAs (Guerin et al, 1999;Mester et al, 1996).…”

Section: Arsenic Speciation Hyphenated Techniquesmentioning

confidence: 99%

Arsenic Speciation Analysis in Water Samples: A Review of The Hyphenated Techniques

Terlecka

2005

Environ Monit Assess

106

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Interests in the determination of different arsenic species in natural waters is caused by the fact that toxic effects of arsenic are connected with its chemical forms and oxidation states. In determinations of water samples inorganic arsenate (As(III), As(V)), methylated metabolities (MMAA, DMAA) and other organic forms such as AsB, AsC, arsenosugars or arsenic containing lipids have the most importance. This article provides information about occurrence of the dominant arsenic forms in various water environments. The main factors controlling arsenic speciation in water are described. The quantification of species is difficult because the concentrations of different forms in water samples are relatively low compared to the detection limits of the available analytical techniques. Several hyphenated methods used in arsenic speciation analysis are described. Specific advantages and disadvantages of methods can define their application for a particular sample analysis. Insufficient selectivity and sensitivity of arsenic speciation methods cause searching for a new or modifications already existing techniques. Some aspects of improvement and modifications of the methods are highlighted.

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Underestimation of the total arsenic concentration by hydride generation techniques as a consequence of the incomplete mineralization of arsenobetaine in acid digestion procedures

Cited by 48 publications

References 6 publications

Decomposition of organoarsenic compounds for total arsenic determination in marine organisms by the hydride generation technique

Decomposition of organoarsenic compounds for total arsenic determination in marine organisms by the hydride generation technique

Determination of As in environmental solid matrix

Arsenic Speciation Analysis in Water Samples: A Review of The Hyphenated Techniques

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