PMID- 15623280
OWN - NLM
STAT- PubMed-not-MEDLINE
DCOM- 20070124
LR  - 20041229
IS  - 0003-2700 (Print)
IS  - 0003-2700 (Linking)
VI  - 77
IP  - 1
DP  - 2005 Jan 1
TI  - Silicone sensing phase for detection of aromatic hydrocarbons in water employing 
      near-infrared spectroscopy.
PG  - 72-7
AB  - The use of silicone for detection of aromatic hydrocarbons in water using 
      near-infrared spectroscopy is proposed. A sensing phase of poly(dimethylsiloxane) 
      (PDMS) was prepared, and a rod of this material was adapted to a transflectance 
      probe for measurements from 850 to 1800 nm. Deionized water samples contaminated 
      separately with known amounts of benzene, toluene, ethylbenzene, and m-xylene 
      were used for evaluation of the PDMS sensing phase, and measurements were made in 
      a closed reactor with constant stirring. Equilibrium states were obtained after 
      90, 180, 360, and 405 min for benzene, toluene, ethylbenzene, and m-xylene, 
      respectively. The PDMS sensing phase showed a reversible response, presenting 
      linear response ranges up to 360, 290, 100, and 80 mg L(-1), with detection 
      limits of 8.0, 7.0, 2.6, and 3.0 mg L(-1) for benzene, toluene, ethylbenzene, and 
      m-xylene, respectively. Reference spectra obtained with different rods showed a 
      relative standard deviation of 0.5%, indicating repeatability in the sensing 
      phase preparation. A relative standard deviation of 6.7% was obtained for 
      measurements performed with six different rods, using a 52 mg L(-1) toluene 
      aqueous solution. The sensing phase was evaluated for identification of sources 
      of contamination of water in simulated studies, employing Brazilian gasoline type 
      A (without ethanol), gasoline type C (with 25% of anhydrous ethanol), and diesel 
      fuel. Principal component analysis was able to classify the water in distinct 
      groups, contaminated by gasoline A, gasoline C, or diesel fuel.
FAU - Albuquerque, Jackson S
AU  - Albuquerque JS
AD  - Departamento de Engenharia Quimica, UFPE, Av. Arthur de Sa, s/n, Cidade 
      Universitaria, 50740-521 Recife, Brazil.
FAU - Pimentel, M Fernanda
AU  - Pimentel MF
FAU - Silva, Valdinete L
AU  - Silva VL
FAU - Raimundo, Ivo M Jr
AU  - Raimundo IM Jr
FAU - Rohwedder, Jarbas J R
AU  - Rohwedder JJ
FAU - Pasquini, Celio
AU  - Pasquini C
LA  - eng
PT  - Journal Article
PL  - United States
TA  - Anal Chem
JT  - Analytical chemistry
JID - 0370536
EDAT- 2004/12/30 09:00
MHDA- 2004/12/30 09:01
CRDT- 2004/12/30 09:00
PHST- 2004/12/30 09:00 [pubmed]
PHST- 2004/12/30 09:01 [medline]
PHST- 2004/12/30 09:00 [entrez]
AID - 10.1021/ac0495788 [doi]
PST - ppublish
SO  - Anal Chem. 2005 Jan 1;77(1):72-7. doi: 10.1021/ac0495788.