CAJ | 학술논문

稀土元素对茶树生长和茶叶品质有系列影响。茶树对轻稀土(La, Ce, Y和Nd等)具有较强的生物富集作用,茶树各部位稀土总量大小为：根＞茎＞老叶＞成熟叶＞叶柄＞芽头,其中茶树叶片中的稀土含量与其老嫩度呈显著的正相关。据报道,我国居民膳食摄入稀土含量均值为0.133 mg/d,而通过饮茶摄入稀土的含量估算为0~0.1129 mg/d,均远小于文献报道的稀土日允许摄入量(1.2~57.6 mg/d),稀土元素饮食暴露水平很低。目前,还没有稀土日允许摄入量的相关标准,但茶叶中稀土总量限量标准和粮食作物一样(2 mg/kg),茶叶不同于粮食作物,在限量的相关标准制订中应充分考虑茶叶的日消费量及稀土元素的水溶性。建议加强稀土食品安全的基础研究和系统性风险评估,以便为完善食品(茶叶)中稀土限量标准提供科学依据。
희토원소대다수생장화다협품질유계렬영향。다수대경희토(La, Ce, Y화Nd등)구유교강적생물부집작용,다수각부위희토총량대소위：근＞경＞로협＞성숙협＞협병＞아두,기중다수협편중적희토함량여기로눈도정현저적정상관。거보도,아국거민선식섭입희토함량균치위0.133 mg/d,이통과음다섭입희토적함량고산위0~0.1129 mg/d,균원소우문헌보도적희토일윤허섭입량(1.2~57.6 mg/d),희토원소음식폭로수평흔저。목전,환몰유희토일윤허섭입량적상관표준,단다협중희토총량한량표준화양식작물일양(2 mg/kg),다협불동우양식작물,재한량적상관표준제정중응충분고필다협적일소비량급희토원소적수용성。건의가강희토식품안전적기출연구화계통성풍험평고,이편위완선식품(다협)중희토한량표준제공과학의거。
Rare earth element can be both a help and a hindrance for tea plants growth and tea quality. Tea plant had an enrichment impact on light rare earth element (La, Ce, Y and Nd,etc.), and the rare earth oxides (RE2O3) content of tea plant in descending order was: root > stem > old leave > mature leave > petiole > bud. There was a significant positive correlation between tenderness of tea leaves and RE2O3content. It was reported that daily intake of RE2O3content from diet was 0.133 mg/d, and the intake through tea consumptionwas estimated to be from 0 mg/d to 0.1129 mg/d, which was far below the acceptable daily intake reported (1.2~57.6 mg/d) and suggested that exposure to level of RE2O3was quite low. Currently, no standard limit for RE2O3 daily intake has been recommended by government. However, the limit for content of RE2O3 in tea was the same with food crops (2 mg/kg). Tea was different from food crops, so we should take full account of its daily consumption quantity and solubility of RE2O3 for setting the limitation. Consequently, basic researches on RE2O3 in food safety and systemic risks assessment were suggested to strengthen to provide scientific basis for setting safety standards.