Simultaneous speciation of chromate, molybdate and arsenate in lysimetric water from geotechnical composites installed in field lysimeters

Abstract

Anion-exchange high performance liquid chromatography inductively coupled plasma mass spectrometry (HPLC-ICP-MS) was used for simultaneous speciation of chromate, molybdate and arsenate. The repeatability of measurement tested for multielemental standard solution of chromate, molybdate and arsenate (50 ng mL−1 of Cr, Mo and As, pH 12) was ± 0.9%, ± 4.9% and ± 4.1%, respectively. Limits of quantification (LOQs) were low (0.53 ng mL−1 for chromate and arsenate and 1.03 ng mL−1 for molybdate, expressed as elemental concentrations). A wide linear concentration range (from LOQs to 500 ng mL−1) was obtained. The performances of this method enabled simultaneous speciation analysis in samples of water from lysimeters, in which three geotechnical composites, made of recycled waste, were installed in parallel in compacted and uncompacted, 20 times less dense form. The release of toxic chemical species of elements into lysimetric waters from each composite was studied. The results revealed that the degree of compaction and the composition of composites both have a significant influence on leaching of chromate, molybdate and arsenate. The study proved that multielemental speciation analysis is fast and cost-effective method for investigations of environmental impacts of materials, made from recycled waste, and can be used in other similar applications.

Atomic spectrometry update: review of advances in elemental speciation

“…The majority of Cr speciation procedures described in the past year have featured HPLC-ICP-MS . The group of Milacic and Scancar has reported on speciation in wine and beer, 65 speciation and bioimaging in dandelions, 66 the simultaneous speciation of arsenate, chromate, and molybdate in lysimeter water, 67 and the reduction of Cr VI by bacteria in tannery effluent. 68 In each of these studies, Cr speciation was carried out by an HPLC-ICP-MS procedure, originally described in 2012, in which analytes were separated on a SAX fast-protein column (Mono Q HR 5/5) that had been conditioned with 1.0 mol L −1 NaCl.…”

“…Additionally, spatially resolved studies of leaves with LA-ICP-MS showed that Cr was localised mainly at the apices, indicating that Cr species were relatively mobile during the transport within the leaf. For speciation of As, Cr and Mo in lysimeter waters, 67 in support of a study of the leaching of these elements from 3 geotechnical composites made of recycled waste in both compacted and uncompacted (20 times less dense) forms, the same HPLC column was used, though this time the eluent was a gradient from 0 to 0.7 mol L −1 over 10 min at a flow rate of 1.5 mL min −1 . The samples were adjusted to pH 12 and 100 μL was injected.…”

“…For the HPLC-ICP-MS speciation of Mo (and As, and Cr) in lysimeter waters 67 in support of a study of the leaching of these elements from three geotechnical composites, made of recycled waste, in both compacted and uncompacted (20 times less dense) forms, a SAX fast-protein column (Mono Q HR 5/5) HPLC column was used, with gradient elution from 0 to 0.7 mol L −1 NaCl over 10 min at a flow rate of 1.5 mL min −1 . The samples were adjusted to pH 12, and 100 μL were injected.…”

In Situ Laser-Induced Breakdown Spectroscopy for Chromium Speciation Analysis Based on the Interactions of Oxygen-Containing Groups with Functionalized Co3O4-rGO: Evidence from Advanced Optical Techniques and Density Functional Theoretical Calculations under Electric Field

“…6 , and AsO 4 3− in 0.2% NaOH and 0.3% Na 2 CO 3 buffer (pH 12). 7 Although the methods described above are accurate enough, they are usually limited to operation in the laboratory. The process of sample collection and transportation might change the temperature and environment, which may lead to changes in the forms of HMIs, affecting the reliability of actual detection.…”

“…Drinčić et al carried out the simultaneous speciation analysis of CrO 4 2– , AsO 4 3– , MoO 4 2– , and VO 4 3– in alkaline samples by high-performance liquid chromatography inductively coupled plasma mass spectrometry (HPLC–ICP-MS) with the obtained limits of detection as 0.2, 0.4, 1, and 2 ng mL –1 , respectively . Djurić et al used anion-exchange HPLC–ICP-MS to analyze CrO 4 2– , MoO 4 2– , and AsO 4 3– in 0.2% NaOH and 0.3% Na 2 CO 3 buffer (pH 12) . Although the methods described above are accurate enough, they are usually limited to operation in the laboratory.…”