| Title |
Analysis of Volatile Organic Compounds in Sediments Using HS-GC/MS - Confirmation of Matrix Effects in External and Internal Standard Methods - |
| Authors |
신명철 ( Myoung-chul Shin ) ; 정다솜 ( Da-som Jung ) ; 노혜란 ( Hye-ran Noh ) ; 유순주 ( Soon-ju Yu ) ; 서용찬 ( Yong-chan Seo ) ; 이보미 ( Bo-mi Lee ) |
| DOI |
https://doi.org/10.15681/KSWE.2021.37.6.510 |
| Keywords |
Headspace; Matrix Interference; Sediment; Volatile Organic Compounds |
| Abstract |
Volatile Organic Compounds (VOCs) in sediments, which can cause human health problems, have been monitored in Korea since 2014. Measured VOC concentrations can be affected by matrix type and the volatility of target substances. In this study, (1) VOCs volatility and the influence of matrix interference were confirmed, and (2) internal standards (IS) method was applied to improve analytical method. For these purposes, method detection limit (MDL), calibration linearity, precision and accuracy of VOCs were compared in various matrices using the IS. Some of VOCs in sediments showed different peak areas and reduced rates compared to water matrix. It was suggested that adsorption properties of sediments hindered the migration to vapor during heat pretreatment in headspace method. A calibration curve was created in clean sand. Recovery rates for the calibration curve method and IS applying method were 64.1~83.1% and 99.1~119.3%, respectively. Relative standard deviations ranged from 11.1% to 21.6% for the calibration curve method and those for IS ranged 4.7% to 13.7%. In case of real sediment, calibration curve and 1,2-Dichlorobenzene-d4 (ODCB) among IS were not suitable. The average recovery rate of Fluorobenzene (FBZ) increased by 56.4% and Relative Standard Deviation (RSD) by 4.7%. However, the recovery rate was increased in the samples with large values of igniting intensity.This study confirmed that influence of the matrix of VOCs in sediment, and addition of IS materials improved precision and accuracy. Although IS corrects volatilization and adsorption, it is recommended that more than two types of IS should be added rather than single. |