目的 通过对一次性发泡餐具中苯乙烯单体迁移量进行检测，初步确定一次性发泡餐具中苯乙烯单体迁移的风险等级。方法 以在广州市不同流通领域购买的一次性发泡餐具样本30批次为研究对象，研究其与水、体积分数为3%的乙酸、体积分数为10%的乙醇、葵花籽油等4种食品模拟物在100 ℃接触2 h后，通过顶空气相色谱-质谱联用法测定食品模拟物中苯乙烯单体的迁移量，计算苯乙烯单体的日累计暴露量，并结合专家评估方式进行风险分析。结果 苯乙烯单体在水、质量分数为3%的乙酸、体积分数为10%的乙醇、葵花籽油等4种食品模拟物中均有迁出，在葵花籽油食品模拟物中苯乙烯单体迁移出来的量较高，其次是水、体积分数为10%的乙醇、质量分数为3%的乙酸；所采集的样本中苯乙烯单体日累计暴露量小于0.01 mg/(kgd)。结论 通过计算苯乙烯单体的日累积暴露量，结果小于JECFA规定的苯乙烯安全摄入量，结合专家评估结果，最终确定一次性发泡餐具中苯乙烯单体迁移的风险等级属于L级（低风险）。

The work aims to initially determine the risk level of the migration amount of styrene monomer in the disposable foamed tableware based on the migration detection of styrene monomer in the disposable foamed tableware. Taking 30 batches of disposable foamed tableware samples purchased in different distribution channels in Guangzhou as the research object, the migration amount of styrene monomer in the food simulants measured by headspace gas chromatography-mass spectrometry was studied after their contact with such four food simulants as water, 3% (volume fraction) acetic acid, 10% (volume fraction) alcohol and sunflower seed oil at 100 ℃ for 2 h. The cumulative daily exposure level of styrene monomer was calculated and the risk analysis was carried out combined with the expert evaluation method. Styrene migrated to all the four food simulants above. The migration amount of styrene in sunflower seed oil was quite high, followed by water, 10% (volume fraction) alcohol and 3% (mass fraction) acetic acid. The cumulative daily exposure of styrene monomer in all samples collected was less than 0.01 mg/(kg•d). Based on the calculation of the cumulative daily exposure of styrene monomer, the exposure is less than the safe intake specified by JECFA. Combined with expert evaluation results, the risk level of the migration of styrene monomer from the disposable foamed tableware is finally determined to be L (low risk).