Lachenmeier Dirk W, Reusch Helmut, Sproll Constanze, Schoeberl Kerstin, Kuballa Thomas
Chemisches und Veterinäruntersuchungsamt (CVUA) Karlsruhe, D-76187 Karlsruhe, Germany.
Food Addit Contam Part A Chem Anal Control Expo Risk Assess. 2008 Oct;25(10):1216-24. doi: 10.1080/02652030802036230.
A survey of benzene contamination of 451 beverage samples, using headspace sampling combined with gas chromatography and mass spectrometry (HS-GC/MS) with a quantification limit of 0.13 microg l(-1), was conducted. Artefactual benzene formation during headspace sampling was excluded by gentle heating at 50 degrees C only and adjustment of sample pH to 10. The incidence of benzene contamination in soft drinks, beverages for babies, alcopops and beer-mixed drinks was relatively low, with average concentrations below the EU drinking-water limit of 1 microg l(-1). Significantly higher concentrations were only found in carrot juice, with the highest levels in carrot juice specifically intended for infants. About 94% of 33 carrot juice for infants had detectable benzene levels, with an average concentration of 1.86 +/- 1.05 microg l(-1). Benzene contamination of beverages was significantly correlated to iron and copper concentrations, which act as catalyst in benzene formation. The formation of benzene in carrot juice was predominantly caused by a heat-induced mechanism, which explains the higher levels in infant carrot juices that are subject to higher heat-treatment to exclude microbiological contamination.
采用顶空进样结合气相色谱 - 质谱联用（HS - GC/MS）法对451份饮料样品中的苯污染情况进行了调查，定量限为0.13 μg l⁻¹。仅通过在50℃温和加热并将样品pH值调至10来排除顶空进样过程中苯的人为生成。软饮料、婴儿饮料、预调酒和啤酒混合饮料中的苯污染发生率相对较低，平均浓度低于欧盟饮用水限值1 μg l⁻¹。仅在胡萝卜汁中发现了明显更高的浓度，专门为婴儿设计的胡萝卜汁中苯含量最高。33份婴儿胡萝卜汁中约94%的苯含量可检测到，平均浓度为1.86±1.05 μg l⁻¹。饮料中的苯污染与铁和铜的浓度显著相关，铁和铜在苯的形成过程中起催化剂作用。胡萝卜汁中苯的形成主要是由热诱导机制引起的，这解释了为排除微生物污染而经过更高热处理的婴儿胡萝卜汁中苯含量较高的原因。
