The Application of XRF in Field Monitoring on Digging Pb-Contaminated Soil

Sun, Xiao Nan; Liu, An Ping; Sun, Xiao

doi:10.4028/scientific5/kem.500.24

Cited by 1 publication

(1 citation statement)

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“…26 A portable, more compact arrangement of the newly designed cell was used to simultaneously determine fifteen elements, with limits of detection as low as 0.04 mg l À1 . 27 X-ray fluorescence (XRF) 28 and laser-induced breakdown spectroscopy (LIBS) 29 are spectrometric techniques commonly used in field analysis. The former presents some advantages, such as minimal sample preparation, non-destructive and fast analysis, good precision and accuracy.…”

Section: Introductionmentioning

confidence: 99%

Enzymatic proteolysis and in situ digestion as strategies to determine Cs and Sr in fish by tungsten coil atomic emission spectrometry

Santos

Donati

Calloway

et al. 2012

J. Anal. At. Spectrom.

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Papain is employed to pre-digest and homogenize fish slurries which are directly placed on a tungsten coil atomizer and digested in situ with an oxidizing mixture of HNO 3 and H 2 O 2 . Both Cs and Sr are determined in different fish samples by tungsten coil atomic emission spectrometry (WCAES) with limits of detection of 0.07 and 0.15 mg l À1 , respectively. Sample aliquots of 50 ml are dried, digested/ pyrolyzed and atomized using a 400 W miniature solid-state constant current power supply and a Visual Basic temperature control program. The portable WCAES instrumental setup is composed of a small metallic atomization cell, a 2.54 cm diameter fused silica lens and a hand-held charge coupled device-based spectrometer. Tungsten filaments extracted from 24 V, 250 W commercially available light bulbs are used as atomizers. The method accuracy is demonstrated by comparing WCAES results with values obtained by ICP OES. No statistically significant differences are observed between the results from each different method at a 95% confidence level. Recovery tests are also carried out for Cs and values between 100 and 110% are obtained. The method precision is calculated to be 6.8 and 7.3% for 2.5 mg l À1 of Cs and 100 mg l À1 of Sr (n ¼ 10), respectively. The method described is simple, fast and efficient, offering an interesting alternative for applications in food safety control and determinations in the field.

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