A review in the sample preparation of aqueous solutions combined with X-ray fluorescence detection

Moradi, Morteza; Yamini, Yadollah; Kakehmam, Jamal; Ahmadi, K.

doi:10.1007/s13738-014-0545-0

Cited by 15 publications

(2 citation statements)

References 41 publications

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“…The method for appropriate collection and preservation of water samples is as important as sample preparation and the subsequent determination method (Moradi et al, 2015). In routine water analysis, it is common practice to collect and store water samples until determination of target analytes begins.…”

Section: Introductionmentioning

confidence: 99%

Stability of organochlorine pesticides during storage in water and loaded SPE disks containing sediment

et al. 2018

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With regard to the Water Framework Directive (WFD) and the required investigation of the whole water sample including suspended particulate matter (SPM), a storage stability study was conducted to determine the suitable storage time and conditions of 21 organochlorine pesticides (OCPs) spiked in water samples and pre-concentrated on solid-phase extraction disks (SPE disks). Furthermore, this work demonstrates the behaviour of three different certified sediment reference materials (CRMs) contaminated with OCPs in water samples as well as loaded on SPE disks under different temperature conditions and storage time periods. Extracts collected on SPE disks were stored for 3, 14 and 30 days at both 4 °C and -18 °C in darkness covered in (a) freezer bags and (b) aluminum foil. With few exceptions the results of these tests demonstrate stability of OCPs up to 30 days at -18 °C. The recoveries for most substances range between 84% and 133%. Furthermore, the stability of OCPs in water samples additionally spiked with CRM up to 500 mg and stored at a temperature of 4 °C in darkness up to 56 days was investigated. The addition of sodium azide enhanced the stability of some substances during storage, especially the endosulfans (I, II) but most substances were stable regardless of sodium azide addition over the entire storage period. An important conclusion of this study is that the storage of loaded SPE disks is an appropriate alternative to storing water samples.

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Section: Introductionmentioning

confidence: 99%

Stability of organochlorine pesticides during storage in water and loaded SPE disks containing sediment

et al. 2018

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“…[2][3][4][5][6] Element analysis of liquid matrices using XRF techniques oen suffer from low signal-to-noise (S/N) ratios leading to the development of a range of different chemical and physical extraction techniques to overcome such problems. Moradi et al 7 offered a review of sample preparation techniques for aqueous solutions including solid-phase extraction (disc, semisolid, particles and electrodeposition), and liquid-phase extraction (supported liquid membrane and liquid-phase micro-extraction). Trojek and Cechak 8 provided an overview of analytical methods used to identify terrestrial radionuclides in samples.…”

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confidence: 99%