RE对三角帆蚌珍珠质促泌作用适宜剂量的研究

EXPERIMENTAL STUDY ON THE OPTIMAL QUANTITY OF RARE EARTH FOR ACCELERATING THE SECREON OF NACRUM OF HYRIOPSIS CUMINGII

采用Ｌ＿９（３￣４）正交表设计，进行了轻稀土、重稀土和混合稀土三因素三水平对珍珠质分泌影响的试验研究。结果表明，轻稀土和全元素混合稀土对三角帆蚌珍珠质的促泌作用显著，其促泌作用大小顺序是：混合稀土＞轻稀土＞重稀土。在本试验条件下，各类稀土对珍珠质促泌的最适浓度分别是：轻稀土为１００～３００ｐｐｍ；重稀土为１００ｐｐｍ；混合稀土为１００ｐｐｍ。

The experiment of effects of light rare earth (LRE),heavy rare earth(HRE)and mixed rare earth(MRE)on the secretion Of matter of pearl iscarried out on three levels according to the La(3￣4) orthogonal layout,Theresults show that the LRE and MRE of total element accelerate the secretionof nacrum significantly ,and the acceleration of MRE is the greatest ,othersare LRE, HRE accordingly . Under the experimental conditions,the optimalconsistency of LRE for accelerating the secretion of nacrum of Hyriopsiscumingii is 50-100 ppm, HRE 50 ppm, and MRE 100 ppm. There are usually radioactive elements in the rare-earth mineral ,suchas ￣(234)Th,￣(238)U and ￣(236)Ra. The low dose of these radioactive elements canaccelerate the secretion of nacrum as well ,but whether the extensive use ofRE contained the radioactive substances will lead to environmental pollutionis a problem deserving of environmentalist’s attention.