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Determination of the presence of benzene in vitamin drinks using headspace - solid phase microextraction and gas chromatography - mass spectrometry

Headspace Solid Phase Microextraction-Gas Chromatography/Mass Spectrometry를 이용한 비타민드링크 제품 중 Benzene의 미량분석

  • 김종훈 (전주대학교 환경시스템학과) ;
  • 이경민 (전주대학교 환경시스템학과)
  • Received : 2007.04.25
  • Accepted : 2007.05.28
  • Published : 2007.06.28

Abstract

The presence of benzene in 31 products of vitamin drinks purchased from 20 retail outlets was determined using headspace solid phase microextraction (HS-SPME) and gas chromatography-mass spectrometry (GC-MS). The sample (25 ml) was stirred at 1200 rpm for 4 min using a magnetic bar with a $100{\mu}m$ SPME fiber as an adsorbent for benzene which was then desorbed from the fiber for 1 min in the GC injector. Quantitation was achieved using the standard addition method. The limit of detection was determined as 0.56 ng/ml and over a concentration range 0-40 ng/ml the coefficient of correlation was greater than 0.999. The concentration of benzene in the drinks examined was in the range not detectable to 47.35 ng/ml. Benzene was detected in 15 of the drinks with concentration in 5 of them greater than 10 ng/ml which is the limit set for the presence of benzene in the Drinking Water Regulations. The concentrations of benzene in the 5 drinks which exceeded the limit of 10 ng/ml were 16.99, 35.14, 16.03, 47.35 and 14.28 ng/ml respectively.

현재 시중에서 판매되고 있는 비타민드링크 제품 중 20개사 31개 제품의 벤젠 함량을 headspace-solid phase microextraction(HS-SPME)법을 이용하여 GC/MS-SIM으로 분석을 하였다. SPME fiber는 $100{\mu}m$ PDMS를 사용하였다. 또한 정량방법은 표준물첨가법을 사용하였으며 40 mL vial에 용액 25 mL를 취하고 그 안에 자석젓개를 넣어 1200 rpm에서 교반시키고 4분 동안 흡착시킨 후 1분 동안 GC에서 탈착시켜 표준검량곡선을 작성하였다. 이 때 검량곡선의 상관계수 값은 0.999이상을 나타내었다. 검출한계는 시료를 분석할 때마다 산출하였는데 평균값이 0.56 ng/mL(${\pm}0.43$)이었으며 회귀식이 존재하는 농도의 범위는 0~40 ng/mL였다. 그 결과 시료 중 벤젠의 함유량은 nd~47.35 ng/mL의 농도의 범위였다. 전체 시료 중 15개의 제품에서 벤젠이 검출되었으며 그 중 5개의 제품에서는 벤젠의 함량이 먹는 물 수질기준인 10 ng/mL를 넘는 각각 16.99 ng/mL, 35.14 ng/mL, 16.03 ng/mL, 47.35 ng/mL, 14.28 ng/mL가 검출되었다.

Keywords

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