Solid-phase spectrophotometric and test determination of silicate in natural water

Zaporozhets, Olga A.; Bas, Julia; Kachan, Igor A.; Zinko, Lionel S.; Davydov, Valentyn I.

doi:10.1016/j.talanta.2011.12.079

Cited by 7 publications

(8 citation statements)

References 16 publications

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“…Silicate (SiO 3 2− ) and arsenate (AsO 4 3− ) are two major interference ions of molybdenum blue method, because their chemical behavior and formation conditions are similar to those of o -PO 4 3− 2 , 26 . The results showed that the proposed d-MSPE tolerated the presence of SiO 3 2− up to 6 mg Si L −1 , which is higher than the level found in most natural waters 33 . However, in this study AsO 4 3− was found to seriously hinder the analysis when presented even at the very low level of 0.001 mg As L −1 34 .…”

Section: Resultsmentioning

confidence: 75%

Colorimetric determination of trace orthophosphate in water by using C18-functionalized silica coated magnetite

Phouthavong

Manakasettharn

Viboonratanasri

et al. 2021

Sci Rep

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In this study, we customized magnetic sorbents by functionalizing silica coated magnetite with octadecyl(C18)silane (Fe3O4@SiO2@C18). This sorbent was intended for the determination of trace orthophosphate (o-PO43−) in unpolluted freshwater samples. The o-PO43− was transformed to phosphomolybdenum blue (PMB), a known polyoxometalate ion. Then the PMB were coupled with cetyl trimethyl ammonium bromide (CTAB), cationic surfactant, in order to hydrophobically bound with the Fe3O4@SiO2@C18 particles through dispersive magnetic solid-phase extraction (d-MSPE) as part of sample preconcentration. The PMB–CTAB–magnetic particles are simply separated from the aqueous solution by the external magnet. The acidified ethanol 0.5 mL was used as PMB-CTAB eluent to produce an intense blue solution, which the absorbance was measured using a UV–Vis spectrophotometer at 800 nm. The proposed method (employing 2 mg of Fe3O4@SiO2@C18) yielded an enhancement factor of 32 with a linear range of 1.0–30.0 µg P L−1. Precision at 6.0 µg P L−1 and 25.0 µg P L−1 were 3.70 and 2.49% (RSD, n = 6) respectively. The lower detection limit of 0.3 µg P L−1 and quantification limit of 1.0 µg P L−1 allowed trace levels analysis of o-PO43− in samples. The reliability and accuracy of the proposed method were confirmed by using a certified reference material. Our method offers highly sensitive detection of o-PO43− with simple procedures that can be operated at room temperature and short analysis time.

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Section: Resultsmentioning

confidence: 75%

Colorimetric determination of trace orthophosphate in water by using C18-functionalized silica coated magnetite

Phouthavong

Manakasettharn

Viboonratanasri

et al. 2021

Sci Rep

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“…The linear equation is: C ¼ 3.15956A À 0.51912, where C is the concentration of Si (mg L À1 ) and the linear scope of silica concentration is 0.2-1.8 mg L À1 , and A is the absorbance. The linear correlation coefficient R is more than 0.9992, however, the best linear correlation coefficient R is 0.998, 3,26,32,38 that means that this linear equation has a better linear correlation and can satisfy the photometric measurement of silica. …”

Section: Standard Work Curvementioning

confidence: 99%

Molybdenum blue photometry method for the determination of colloidal silica and soluble silica in leaching solution

Yang

Wei

et al. 2015

Anal. Methods

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An improved analytical procedure has been described for the spectrophotometric determination of colloidal silica in leaching solution by means of adding fluoride to convert colloidal silica into reactive silica. The method is a variation of the classical molybdenum blue method, and the optimal wavelength, temperature, ratio of H 3 BO 3 /NH 4 F, pH and ammonium molybdate in the colorimetric process has been determined. The pH especially needs to be fairly strictly controlled. The linear equation is established as: C ¼ 3.15956A À 0.51912, and R is more than 0.9992. Its feasibility and reproducibility have been confirmed by ICP-OES; the average relative error is 1.5%. The detection scope of silicon concentration extends almost 1000 times higher in a leaching solution, so the method in this paper can be used to detect leaching samples with a high silica concentration.

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“…In most cases application of modern physicochemical methods and newest instrumentation during the microelements determination in natural waters and technological solutions requires the pretreatment of samples which, in particular, includes preconcentration, withdrawal, and/or separation of elements. One of the most effective techniques is the solid-phase extraction (SPE) method with the application of various sorbents—polymeric resins (Ayata et al., 2009; Fisher and Kara, 2016; Tan et al., 2014; Tuzen et al., 2005), modified high dispersed silica (Fisher and Kara, 2016; Tan et al., 2014, Thabano et al., 2009; Zaporozhets et al., 2012; Zougagh et al., 2005), activated carbon (Daorattanachai et al., 2005; Yusof et al., 2007), synthetic zeolites (De Pena et al., 2000). Recently, the popularity of natural zeolites has increased (for SPE applications) (Al-Degs et al., 2008; Chen et al., 2009; Faghihian et al., 2009; Faghihian and Kabiri-Tadi, 2010; Fisher and Kara, 2016; Vasylechko et al, 2015, 1999b, 2001) because of a number of advantages over other sorbents.…”

Section: Introductionmentioning

confidence: 99%

Solid phase extractive preconcentration of silver from aqueous samples and antimicrobial properties of the clinoptilolite–Ag composite

Vasylechko

Fedorenko

Gromyko

et al. 2017

Adsorption Science & Technology

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Sorptive properties of the Transcarpathian clinoptilolite compared to Ag(I) were studied in a dynamic way. The sorptive capacity value of clinoptilolite under the optimal conditions is 11.7 mg of Ag per 1 g of zeolite. The solid-phase extraction procedure with natural clinoptilolite thermally activated at 550℃ was used to preconcentrate trace amounts of silver ions in aqueous solutions to be finally determined by the atomic absorption method. It was established that the Ag–clinoptilolite composite has a powerful antimicrobial effect against gram-negative bacteria and yeasts as well as affects significantly vital activity of Staphylococcus aureus.

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Solid-phase spectrophotometric and test determination of silicate in natural water

Cited by 7 publications

References 16 publications

Colorimetric determination of trace orthophosphate in water by using C18-functionalized silica coated magnetite

Colorimetric determination of trace orthophosphate in water by using C18-functionalized silica coated magnetite

Molybdenum blue photometry method for the determination of colloidal silica and soluble silica in leaching solution

Solid phase extractive preconcentration of silver from aqueous samples and antimicrobial properties of the clinoptilolite–Ag composite

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