PMID- 22380461
OWN - NLM
STAT- PubMed-not-MEDLINE
DCOM- 20120723
LR  - 20120321
IS  - 1520-6882 (Electronic)
IS  - 0003-2700 (Linking)
VI  - 84
IP  - 6
DP  - 2012 Mar 20
TI  - Nanosemiconductor-based photocatalytic vapor generation systems for subsequent 
      selenium determination and speciation with atomic fluorescence spectrometry and 
      inductively coupled plasma mass spectrometry.
PG  - 2974-81
LID - 10.1021/ac3001995 [doi]
AB  - We reported novel Ag-TiO(2)- and ZrO(2)-based photocatalytic vapor generation 
      (PCVG) systems as effective sample introduction techniques for further improving 
      the sensitivity of the atomic spectrometric determination of selenium for the 
      first time, in which the conduction band electron served as a "reductant" to 
      reduce selenium species including Se(VI) and convert them directly into volatile 
      H(2)Se, which was easily separated from the sample matrix and underwent more 
      effectively subsequent atomization and/or ionization. These two PCVG systems 
      helped us to overcome the problem encountered in the most conventional 
      KBH(4)/OH(-)-H(+) system, in that Se(VI) was hardly converted into volatile 
      selenium species without the aid of prereduction procedures. The limits of 
      detection (LODs) (3sigma) of the four most typical Se(IV), Se(VI), selenocystine 
      ((SeCys)(2)), and selenomethionine (SeMet) species were, respectively, down to 
      1.2, 1.8, 7.4, and 0.9 ng mL(-1) in UV/Ag-TiO(2)-HCOOH, and 0.7, 1.0, 4.2, and 
      0.5 ng mL(-1) in UV/ZrO(2)-HCOOH with the relative standard deviations (RSDs) 
      lower than 5.1% (n = 9 at 1 mug mL(-1)) when using atomic fluorescence 
      spectrometry (AFS) under flow injection mode. They reached 10, 14, 18, and 8 pg 
      mL(-1) in UV/Ag-TiO(2)-HCOOH, and 6, 7, 10, and 5 pg mL(-1) in UV/ZrO(2)-HCOOH 
      with the RSDs lower than 4.4% (n = 9 at 10 ng mL(-1)) when using inductively 
      coupled plasma mass spectrometry (ICPMS). After the two PCVG systems were 
      validated using certified reference materials GBW(E)080395 and SELM-1, they were 
      applied to determine the total Se in the selenium-enriched yeast sample and used 
      as interfaces between high-performance liquid chromatography (HPLC) and AFS or 
      ICPMS for selenium speciation in the water- and/or enzyme-extractable fractions 
      of the selenium-enriched yeast.
FAU - Li, Huamin
AU  - Li H
AD  - Department of Chemistry and the Key Laboratory of Analytical Sciences, College of 
      Chemistry and Chemical Engineering, Xiamen University, Xiamen, China.
FAU - Luo, Yacui
AU  - Luo Y
FAU - Li, Zhaoxin
AU  - Li Z
FAU - Yang, Limin
AU  - Yang L
FAU - Wang, Qiuquan
AU  - Wang Q
LA  - eng
PT  - Journal Article
DEP - 20120228
PL  - United States
TA  - Anal Chem
JT  - Analytical chemistry
JID - 0370536
EDAT- 2012/03/03 06:00
MHDA- 2012/03/03 06:01
CRDT- 2012/03/03 06:00
PHST- 2012/03/03 06:00 [entrez]
PHST- 2012/03/03 06:00 [pubmed]
PHST- 2012/03/03 06:01 [medline]
AID - 10.1021/ac3001995 [doi]
PST - ppublish
SO  - Anal Chem. 2012 Mar 20;84(6):2974-81. doi: 10.1021/ac3001995. Epub 2012 Feb 28.