Determination of total selenium and dissolved selenium species in natural waters by fluorometry

1994 ◽  
Vol 28 (3) ◽  
pp. 383-387 ◽  
Author(s):  
Dacheng. Wang ◽  
Georg. Alfthan ◽  
Antti. Aro
Keyword(s):  
Natural Waters ◽  
Selenium Species ◽  
Dissolved Selenium ◽  
Total Selenium

scholarly journals Methodological aspects concerning sampling and determination of total selenium and selenium species in geothermal waters

2020 ◽  
Vol 18 (1) ◽  
pp. 5-16 ◽  
Author(s):  
Piotr Rusiniak ◽  
Anna Ruszczyńska ◽  
Katarzyna Wątor ◽  
Ewa Bulska ◽  
Ewa Kmiecik
Keyword(s):  
Limit Of Detection ◽  
Selenium Concentration ◽  
Geothermal Water ◽  
Limit Of Quantification ◽  
Geothermal Waters ◽  
Selenium Species ◽  
Icp Ms ◽  
Significant Difference ◽  
Total Selenium

AbstractThe work presents the results of geothermal water sample analysis with respect to the determination of total selenium concentration. For this purpose, geothermal water (GT) samples were collected from three different intakes (GT-1, GT-2, GT-3) with similar temperatures of about 85°C. Tests were carried out to see if the methodology of sample preparation influenced total selenium concentration during analysis by inductively coupled plasma mass spectrometry (ICP-MS). Samples (raw and filtered) were preserved with nitric acid (HNO3) and mineralised in the laboratory. From the data obtained it was found that there is no significant difference between total selenium concentration in raw and filtered samples. Following mineralisation, the concentrations in the samples were below the limit of detection or limit of quantification. While different analytical steps or procedures are applied, the results of total selenium concentration can vary. Furthermore, high-performance liquid chromatography coupled with ICP-MS was used for the identification of selenium species. The results revealed that hexavalent selenium – Se(VI) – in the geothermal water was found only in samples collected from the GT-2 and GT-3 intakes.

scholarly journals Speciation and Determination of Selenium Oxyanions at the Drinking Water Pollution Concentration Levels

Separations ◽  
2021 ◽  
Vol 8 (3) ◽  
pp. 27
Author(s):  
Kyriaki Kalaitzidou ◽  
Evangelia Bidiou ◽  
Anastasios Zouboulis ◽  
Manassis Mitrakas
Keyword(s):  
Natural Organic Matter ◽  
Natural Waters ◽  
Major Ions ◽  
Ph Value ◽  
Selective Adsorption ◽  
Polluted Waters ◽  
Relevant Material ◽  
Total Selenium ◽  
Concentration Levels

The research on selenium presence in water resources has revealed the need to determine the respective aquatic species. As selenium oxyanions SeO32− (SeIV) and SeO42− (SeVI) predominate in natural waters, their determination is essential, mainly due to different ecotoxicity properties, as well as to different removal options from relevant-polluted waters. This study focuses on the SeO32−/SeO42− speciation/separation and determination through the selective adsorption of SeO32− only onto specific iron oxy-hydroxides (FeOOHs). For this purpose, the laboratory prepared FeOOHs examined along with the commercially available relevant material (Bayoxide), which was found to present optimum results for the speciation of selenium oxyanions, at the low concentration range 10–100 μg/L, using a dose of 0.5 g/L of adsorbent and gently stirring for 30 min at the usually encountered pH value of 7.3 ± 0.2. Moreover, the relevant experiments showed that the other major ions Cl−, HCO3−, NO3−, SO42−, Ca2+, Mg2+, Na+, possibly found in most natural waters at the concentration range 0–200 mg/L, as well as silicon, total organic carbon (TOC) of natural organic matter (NOM) and iron at the concentration range 0–50 mg/L, 0–5 mg/L and 0–1 mg/L, respectively, did not interfere with the selective adsorption of Se(IV). Furthermore, the most important advantage of this selective speciation method is its implementation/combination with all commonly applied analytical methods for the determination of total selenium.

scholarly journals Analysis of Interlaboratory Performance in the Determination of Total Selenium in Water

1999 ◽  
Vol 82 (6) ◽  
pp. 1466-1473 ◽  
Author(s):  
Peter J Steinhoff ◽  
Brain W Smith ◽  
Dewey W Warner ◽  
Gregory Möller
Keyword(s):  
Reference Material ◽  
Analytical Methods ◽  
Natural Waters ◽  
Hydride Generation ◽  
Sample Introduction ◽  
Superior Performance ◽  
Statistical Uncertainty ◽  
Interlaboratory Variability ◽  
Total Selenium

Abstract This study explored the performance of experienced laboratories in the analysis for total selenium in water by a variety of analytical methods. The goal of the study was to examine intra- and interlaboratory variability. Replicates (n = 7) of 7 sample types that included a reference material of known Se concentration, natural waters, and treated wastewaters were submitted to 7 laboratories with prequalified Se analytical experience. Results of the study indicated wide ranges in minimum and maximum results, distinct differences in laboratory precision, and routine reporting of numerical results below statistical limits of quantitation. Hydride generation as a sample introduction technique demonstrated superior performance. In general, the study supports a caution advisory about using low-level Se data, especially results lower than about 10 µg Se/L, without quantitating the statistical uncertainty of the data. Because this study used data from samples that were submitted in bulk to participating laboratories prequalified for Se analytical expertise and experience, it can be considered a best-case demonstration of performance.

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