US EPA

4728426 

Journal Article 

Ordered mesoporous silicon doped with HPMo-SiO2 solid phase extraction of trace Pb prior to flame atomic absorption spectrometry determination 

Liu, J; Sun, H; Zheng, Y; Wang, Q; Guo, J; Wu, Y 

2018 

1 

Micro and Nano Letters
ISSN: 1750-0443 

13 

5 

606-610 

10.1049/mnl.2017.0915 

WOS:000431298100008 

A new selective and sensitivity method for lead (Pb) determination by flame atomic absorption spectrometry has been established using an ordered mesoporous silicon doped with phosphomolybdic acid (HPMo-SiO2) material as an adsorbent. The possible adsorptive mechanism was speculated, and factors affecting its adsorptive behaviours of Pb were investigated in detail. At potassium hydrogen phthalate media, Pb can be quantitatively adsorbed at pH 3.0-6.0, and HPMo-SiO2 exhibited good selectivity toward it. With an enrichment factor of 50, the detection limit and relative standard deviation of Pb are 0.78 ng ml(-1) and 0.76 % (n = 9 and C = 2.0 ng ml(-1)), respectively. The proposed method has been applied to the determination of Pb in human serum, waste water, pond water, soil and whitening cosmetics with recoveries of 93.9-108.5%. To validate the accuracy verification, a GSB-07-1183-2000 certified reference was analysed, and the result is in good agreement with the certified value. 

molybdenum compounds; silicon compounds; mesoporous materials; lead; doping; atomic absorption spectroscopy; adsorption; recovery; doped ordered mesoporous silicon; solid phase extraction; flame atomic absorption spectrometry; sensitivity method; lead determination; phosphomolybdic acid; adsorptive mechanism; potassium hydrogen phthalate media; enrichment factor; detection limit; human serum; waste water; pond water; soil; whitening cosmetics; recoveries; Pb; SiO2