PMID- 30719906
OWN - NLM
STAT- PubMed-not-MEDLINE
DCOM- 20200331
LR  - 20200331
IS  - 1520-6882 (Electronic)
IS  - 0003-2700 (Linking)
VI  - 91
IP  - 5
DP  - 2019 Mar 5
TI  - Photochemical Vapor Generation for Colorimetric Speciation of Inorganic Selenium.
PG  - 3508-3515
LID - 10.1021/acs.analchem.8b05117 [doi]
AB  - Gold nanoparticles (AuNPs) are widely used as optical probes in colorimetric 
      detection, thanks to their high molar extinction coefficient. However, sample 
      matrixes of high salinity or strong acidity/alkalinity often break the 
      electrostatic repulsion of AuNPs suspension, or/and the surface functionality of 
      AuNPs, causing strong and unfavorable interferences. Photochemical vapor 
      generation (PVG) is an efficient technique for the sample matrix separation. 
      Besides, it possesses distinct features of green reducing reagent, reduced 
      interferences from concomitant elements, and direct speciation by the assistance 
      of photocatalyst. Herein, we developed a photochemical vapor generation (PVG) 
      method for the green and direct speciation analysis of inorganic selenium (i.e., 
      Se(IV) and Se(VI)), by colorimetric or visual monitoring of unmodified AuNPs. The 
      generated Se species from PVG were directed into the AuNPs solution for a 
      reaction to take place, which produced a specific new absorption band at 600 nm 
      for detection. The experimental parameters, including the concentration of 
      organic acid, the sample flow rate, the concentration of AuNPs, and the flow rate 
      of carries gas, were optimized in detail. Under optimized conditions, the limits 
      of detection (LOD) for Se(IV) and Se(VI) were 0.007 and 0.006 mug mL(-1) by UV-vis 
      detection, respectively. It is worth mentioning that 0.08 mug mL(-1) Se can induce 
      an obvious color change, which can be directly observed with the naked eye. 
      Relative standard deviations (RSDs) of 4.5% and 4.3% were obtained from seven 
      replicate measurements of 0.15 mug mL(-1) Se(IV) and Se(VI) standard solution, 
      respectively. The developed assay has been successfully applied for the 
      speciation of Se in a dietary supplement sample and environmental water samples 
      including lake water, seawater, simulated water reference materials, and tap 
      water.
FAU - Ding, Yonggang
AU  - Ding Y
FAU - Liu, Yu
AU  - Liu Y
FAU - Chen, Youliang
AU  - Chen Y
FAU - Huang, Yi
AU  - Huang Y
FAU - Gao, Ying
AU  - Gao Y
AUID- ORCID: 0000-0002-5423-8474
LA  - eng
PT  - Journal Article
PT  - Research Support, Non-U.S. Gov't
DEP - 20190215
PL  - United States
TA  - Anal Chem
JT  - Analytical chemistry
JID - 0370536
SB  - IM
EDAT- 2019/02/06 06:00
MHDA- 2019/02/06 06:01
CRDT- 2019/02/06 06:00
PHST- 2019/02/06 06:00 [pubmed]
PHST- 2019/02/06 06:01 [medline]
PHST- 2019/02/06 06:00 [entrez]
AID - 10.1021/acs.analchem.8b05117 [doi]
PST - ppublish
SO  - Anal Chem. 2019 Mar 5;91(5):3508-3515. doi: 10.1021/acs.analchem.8b05117. Epub 
      2019 Feb 15.