Abstract
The levels of sulfites in wooden chopsticks were analyzed using two different methods, distillation-alkali titration and ion chromatography. According to the two methods, Sulfur dioxide($SO_2$) was validated by 0.6 and 0.2 ${\mu}ml$ of limit of detection(LOD), 1.8 and 0.5 ${\mu}ml$ of limit of quantification, (LOQ) and a $R^2>0.998$ for linearity, respectively. The recoveries of $SO_2$ from food simulants spiked ar levels of 100 ppm were 70.2-100.2%. 158 samples of wooden chopsticks were monitored the migrated amounts of sulfites. Sulfites were detected in 30 samples in ranged of 0.6 to 15.5 ppm. Maximum migration level, 15.5 ppm of sulfites was considered giving no harmful effect to human since it was reached 5.5% of estimated SML.
통기증류알칼리적정법과 이온크로마토그래피법을 이용하여 식품용 나무젓가락 중 이산화황 분석방법을 확립하였으며, 이때 확립된 두 가지 분석방법에 대한 검증 결과, 각각 0.6 ${\mu}ml$ 및 0.2 ${\mu}ml$ 검출한계, 1.8 ${\mu}ml$ 및 0.5 ${\mu}ml$의 정량한계, $R^2=0.998$ 이상의 직선성을 나타내었으며, 식품유사용매에 대하여 70.2-100.2% 이상의 회수율을 확인할 수 있었다. 또한, 확립된 분석법을 각각 적용하여 국내 유통 나무젓가락 총 158품목을 대상으로 이산화황에 대한 이행량 실태를 조사한 결과, 158품목 중 30품목에서 $0.6{\sim}15.5$ ppm의 이산화황이 이행되었으나, 이때 최고 검출량 15.5 ppm은 추정 SML(280 ppm)의 5.5% 수준으로 안전한 것으로 평가되었다.
