Application of a sequential extraction scheme to ten geological certified reference materials for the determination of 20 elements

1996 ◽  
Vol 11 (9) ◽  
pp. 787 ◽  
Author(s):  
Gwendy E. M. Hall ◽  
Gilles Gauthier ◽  
Jean-Claude Pelchat ◽  
Pierre Pelchat ◽  
Judy E. Vaive
Keyword(s):  
Sequential Extraction ◽  
Reference Materials ◽  
Certified Reference Materials ◽  
Extraction Scheme ◽  
Sequential Extraction Scheme

Determination of 27 metals in HISS-1, MESS-4 and PACS-3 marine sediment certified reference materials by the BCR sequential extraction

Talanta ◽  
2021 ◽  
Vol 221 ◽  
pp. 121543 ◽  
Author(s):  
Paramee Kumkrong ◽  
Patrick H.J. Mercier ◽  
Indu Pihilligawa Gedara ◽  
Ovi Mihai ◽  
Daniel D. Tyo ◽  
...  
Keyword(s):  
Sequential Extraction ◽  
Reference Materials ◽  
Marine Sediment ◽  
Certified Reference Materials ◽  
Bcr Sequential Extraction

scholarly journals Optimization of a sequential extraction procedure for trace elements in Arctic PM10

2020 ◽  
Vol 412 (27) ◽  
pp. 7429-7440
Author(s):  
Eleonora Conca ◽  
Mery Malandrino ◽  
Agnese Giacomino ◽  
Emanuele Costa ◽  
Francisco Ardini ◽  
...  
Keyword(s):  
Trace Elements ◽  
Sequential Extraction ◽  
Certified Reference Materials ◽  
Extraction Procedure ◽  
Extraction Methods ◽  
Remote Areas ◽  
Low Concentrations ◽  
Qualitative Variables ◽  
Extraction Scheme

Abstract In this work, a two-step sequential extraction scheme for the determination of trace elements in Arctic PM10 samples was optimized by using two certified reference materials (CRMs). By means of an experimental design for qualitative variables, the five most common extracting solutions for particulate matter (PM) sequential extraction (high purity water (HPW), 0.032 M HNO3, 0.022 M HCl, 0.11 M CH3COOH, and 0.012 M CH3COOH/CH3COONH4 buffer) and two different extraction methods (stirring and ultrasounds) were compared. The purpose of the study was the identification of the procedure which gives the best estimation of the anthropogenic portion of the elements present in PM10 samples. The use of ultrasounds instead of stirring induced a low but significant decrease of the extraction of all the elements and a decrease in the repeatability of the procedure. Diluted HNO3 was the extractant which allowed to maximize the extraction of anthropogenic elements (As, Cd, Pb, Zn) with respect to crustal ones (Al, Si, Ti). The optimized procedure proved successful in avoiding contaminations and, therefore, suitable to be applied to PM samples having extremely low concentrations, such as samples collected in polar or other remote areas. The chosen procedure was applied to ten Arctic PM10 samples, allowing for a better identification of their sources. Indeed, it was possible to hypothesize that even though the concentrations of As, Cd, K, Mg, Mn, and Ni in spring and summer were different, their mobility and, therefore, their chemical form in the analyzed PM10 samples were probably similar.

Thallium fractionation in polluted environmental samples using a modified BCR three-step sequential extraction procedure and its determination by electrothermal atomic absorption spectrometry

2008 ◽  
Vol 62 (2) ◽  
Author(s):  
Ján Medved’ ◽  
Milan Kališ ◽  
Ingrid Hagarová ◽  
Peter Matúš ◽  
Marek Bujdoš ◽  
...  
Keyword(s):  
Sequential Extraction ◽  
Reference Materials ◽  
Environmental Samples ◽  
Limit Of Detection ◽  
Certified Reference Materials ◽  
Electrothermal Atomic Absorption Spectrometry ◽  
Extraction Procedure ◽  
Sequential Extraction Procedure ◽  
Residual Fraction

AbstractDetermination of thallium in polluted environmental samples and their extracts obtained by a modified BCR three-step sequential extraction procedure was used to study thallium distribution and mobility in the monitored polluted area affected by acidification (Šobov, Central Slovakia). The results of fractionation applied to 5 soil certified reference materials and 14 environmental samples show that the vast majority of thallium occurred in the residual fraction. This means that highly toxic thallium is strongly entrapped in the parent rock materials remains immobile and its environmental toxicity is therefore reduced. The limit of detection for thallium in the studied fractions was lower than 0.050 mg kg−1, the precision (RSD) of the ultratrace determination of thallium in the studied fractions was better than 17 % and the accuracy of the used method was verified by analyzing certified reference materials.

An alternative sequential extraction scheme for the determination of trace elements in ferrihydrite rich sediments

Talanta ◽  
2019 ◽  
Vol 199 ◽  
pp. 80-88 ◽  
Author(s):  
Martine Leermakers ◽  
Bao Elvis Mbachou ◽  
Angelique Husson ◽  
Vincent Lagneau ◽  
Michael Descostes
Keyword(s):  
Trace Elements ◽  
Sequential Extraction ◽  
Extraction Scheme ◽  
Sequential Extraction Scheme

APPLICATION OF AAS AND NAA FOR DETERMINATION OF TIN IN SRMs, AND IN ANIMAL AND HUMAN ORGANS

1992 ◽  
Vol 02 (04) ◽  
pp. 489-491 ◽  
Author(s):  
MOMOKO CHIBA ◽  
VENKATESH G. IYENGAR
Keyword(s):  
Neutron Activation Analysis ◽  
Activation Analysis ◽  
Reference Materials ◽  
Certified Reference Materials ◽  
Analytical Techniques ◽  
Absorption Spectrometry ◽  
Dry Weight ◽  
Mixed Diet ◽  
Human Organs

Tin (Sn) is one of the causative elements of the environmental pollution. As no certified reference materials for Sn are presently available, existing reference materials were analyzed for Sn by two independent analytical techniques; atomic absorption spectrometry (AAS) and neutron activation analysis (NAA). The results obtained by both methods were in agreement except for mixed diet which contains Sn in the range of 50 μ g/g. Further, tin concentrations in human and animal organs have been examined by AAS. Among organs tested tin concentrations in testes were the highest, 2.08±0.62 μ g/g dry weight (mean ±SD, n=12) in humans, and 1.45±0.55 μ g/g (n=8) in mice.

scholarly journals Cost-effective Method of Analysis for the Determination of Cadmium, Copper, Nickel and Zinc in Cocoa Beans and Chocolates

2014 ◽  
Vol 4 (1) ◽  
pp. 193 ◽  
Author(s):  
Gideon Ramtahal ◽  
Ivan Chang Yen ◽  
Isaac Bekele ◽  
Frances Bekele ◽  
Lawrence Wilson ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Reference Materials ◽  
Certified Reference Materials ◽  
Control Sample ◽  
Cost Effective ◽  
Cocoa Beans ◽  
Copper Nickel ◽  
Flame Atomic Absorption

<p>The determination of heavy metals in cocoa beans and chocolates is of great importance, due to increasingly stringent regulations being implemented by international legislative bodies and chocolate manufacturers, to protect the health of their consumers. While various techniques exist for heavy metal analyses in cocoa, this study developed a cost-effective, accurate and precise method capable of processing up to 120 samples per batch for the determination of cadmium, copper, nickel and zinc. For sample extractions, a normal laboratory hot plate and locally fabricated high-capacity digestion blocks were used, instead of dedicated block digestion or microwave digestion systems. In addition, only concentrated nitric acid was used, instead of mixed reagents used in standardized methods, for metal extractions from samples, with a sample: extractant ratio of 0.5 g : 10 mL, digestion at 130 ºC, followed by filtration and analysis by flame atomic absorption spectrophotometry. The method was validated with Certified Reference Materials, with heavy metal recoveries generally &gt;95%. Additionally, an in-house quality control sample of ground cocoa nib analyzed together with the Certified Reference Materials was used to monitor the consistency of analyses of heavy metals in cocoa bean samples.</p>

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