Title

Determination Of Polycyclic Aromatic Hydrocarbons With Molecular Weight 302 In Water Samples By Solid-Phase Nano-Extraction And Laser Excited Time-Resolved Shpol'Skii Spectroscopy

Abstract

Monitoring of high-molecular weight polycyclic aromatic hydrocarbons (HMW-PAH) via simple and cost effective methods still remains a challenge. In this article, we combine solid-phase nano-extraction (SPNE) and 4.2 K laser-excited time resolved Shpol'skii spectroscopy (LETRSS) into a valuable alternative for the water analysis of dibenzo[a,l]pyrene, dibenzo[a,h]pyrene, dibenzo[a,i]pyrene and naphtho[2,3-a]pyrene. In comparison to the original SPNE procedure, the present method improves PAH recoveries and reduces extraction time from 30 to 20 min per sample. Quantitative release of HMW-PAH into the Shpol'skii matrix (n-octane) is best accomplished with a mixture of 48 μL of methanol and 2 μL of 1-pentanethiol. Their migration into the 50 μL layer of n-octane provides highly resolved spectra with distinct fluorescence lifetimes for unambiguous isomer determination. Complete analysis takes less than 30 min per sample and consumes only 100 micro-liters of organic solvents. 500 μL of water are sufficient to obtain limits of detection ranging from 16 ng L-1 (dibenzo[a,l]pyrene) to 55 ng L-1 (dibenzo[a,i]pyrene), relative standard deviations better than 3% and analytical recoveries above 90%. Although a straightforward comparison to chromatographic methods is not possible because of the lack of analytical figures of merit on HMW-PAH, the excellent precision of measurements, limits of detection and overall recoveries makes SPNE-LETRSS an attractive approach to water analysis of HMW-PAH. © 2011 The Royal Society of Chemistry.

Publication Date

8-21-2011

Publication Title

Analyst

Volume

136

Issue

16

Number of Pages

3366-3374

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1039/c1an15309a

Socpus ID

79960962590 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/79960962590

This document is currently not available here.

Share

COinS