遵义地区地产茶叶中稀土元素含量特征

Study on Rare Earth Elements Content in Tea Samples from Zunyi

摘要: 稀土元素含量对茶叶品质及质量安全有一定的影响。以贵州省遵义地区地产茶叶为研究对象，采用ICP-MS分析遵义地区5个县区共32份茶叶样品中16种稀土元素含量特征。结果表明：32份样品均检出稀土元素，以稀土氧化物总量计，总残留量范围为0.033~1.785 mg/kg，其中以镧、钇、铈、钪、钕含量较高，且轻稀土含量高于重稀土，占检出总量的66.47%，所有样品均未超出《食品中污染物限量》(GB2762-2012)中规定的茶叶中稀土元素限量标准(≤2.0 mg/kg)，合格率为100%，其研究结果为茶叶质量监管提供一定的参考。

Abstract: Studies indicated that intake of rare earth (RE) elements content in teas could threaten human health. ICP-MS technique was utilized to analyze sixteen rare earth (RE) elements from thirty-two tea samples, which were obtained from five counties in Zunyi. The results indicated that all samples contained RE elements based on total RE elements oxide content. The range of residuals was from 0.033 to 1.785 mg/kg, mainly consisted of La, Yb, Ce, Sc, and Nd, which were accounted for 66.47% of tested RE elements. The content of light RE elements was higher than heavy RE elements. However, RE element content in thirty-two samples did not exceed the concentration benchmark (≤2.0 mg/kg) of national standard (GB2762-2012). The results obtained from this stu- dy could provide some suggestions on management and pollution monitoring of environmental protection department.