连云港海域螺类软体部分重金属和微量元素分析

摘要

The edible parts of 9 marine snails from Lianyungang sea area were analyzed for the contents of trace elements and the safety of heavy metal contents was evaluated. Different marine snails and different tissues of the same species showed variations in the contents of Pb, Cd, Sn, As, Mn, Fe, Ni, Ag, Se, Cr, Co, Zn and Cu. Essential trace elements for humans such as Fe, Cu, Zn, Co, Mn, Cr, Se and Sn were found in all the tested snails, but the heavy metals As, Cd and Pb revealed a high residual index (I) and showed variations among different marine snails and among different tissues. All the snails had As contents exceeding the national food hygiene standard. As and Cd revealed the highest content in the foot muscle and visceral mass of Hemifusus tuba, respectively. Although Pb contents exceeding the national food hygiene standard were found in two samples of Umbonium thomasi (I=6.5 and 5.5, respectively), the foot muscle of Glossaulax didyma (I=2.1) and the visceral mass of H. tuba (I=1.22), the foot muscle and visceral mass of other snails had safe Pb contents and I values smaller than 1. In addition, the foot muscle of H. tuba had a Cr I value of 1.21, while the Cr I values of the visceral mass of Glossaulax didyma and both tissues of eight other sails were less than 1.%分析评价连云港海产螺类可食部分微量元素及重金属含量的安全性。用硝酸-高氯酸消化法消解组织，用电感耦合等离子体原子发射光谱法测定元素含量。结果显示：9种螺类及同种螺不同组织中Pb、Cd、Sn、As、 Mn、Fe、Ni、Ag、Se、Cr、Co、Zn和Cu 13种元素含量存在差异。被测试螺中含有Fe、Cu、Zn、Co、Mn、Cr、 Se和Sn等人体必需微量元素；重金属元素As、Cd和Pb的残留量指数(I)较高，且在不同螺的不同组织中的含量存在显著差异。As在9种螺类中均超标。管角螺足肌As、内脏团Cd的含量最高；Pb在托氏虫昌螺1(I=6.5)和2(I=5.5)、扁玉螺足肌(I=2.1)和管角螺内脏团(I=1.22)含量超标，其余样品低于国家食品卫生标准或I值小于1。除扁玉螺足肌组织外(I=1.21)，扁玉螺内脏团和其余8种螺Cr的I值均小于1。