氟、氯、溴、碘等卤族元素与人体健康的关系

卤族元素是人体的必需元素,正常情况下成人摄入量不超过F4 mg/d、C11.7～5.1g/d、I 100～200μg/d;少年不超过F 3 mg/d,儿童I1μg/kg-d,婴儿Cl0.3～1.2 g/d.过量摄入或缺乏卤族元素,都可能导致疾病的发生.而F含量0.5～1.0mg/L、C1＜50mg/L、Br＞100μg/L、I 10～100μg/L的饮用地下水,有利于人体健康.     

SPATIAL—TEMPORAL VARIATION OF HEAVY METAL ELEMENTS CONTENT IN COVERING SPIL OF RECLAMATION AREA IN FUSHUN COAL MINE

Grid method is employed for sampling covering soil at the test field,which is reclamation area filled by coal mining wastes for cropland in the Fushun coal mine,Liaoning Province,the Northeast China.The soil samples are taken at different locations,including three kinds of covering soil,three different depths of soil layers and four different covering ages of covering soil.The spatial-temporal variation of heavy metal element content in reclamation soil is stud-ied.The results indicate that the content of heavy metal elements is decreasing year after year,the determinant reason why the content of heavy metal elements at 60cm depth layer is higher than that at 30cm depth layer and surface is fertiliz-er and manure application;the metal elements mainly come from external environment;there is no metal pollution coming from mother material (coal mining wastes)in plough layer of covering soil.     

Discovery of 13 New Variable Stars in the Field of the Open Cluster NGC 2168 （M35）

A wide-field time-series CCD photometric survey of variable stars in the field of the open cluster NGC 2168 was carried out using the BATC Schmidt telescope. In total 13 new variable stars are discovered with three W UMa systems, one EA type and two EB type eclipsing binaries (one of them could be a W UMa system), and seven pulsating stars including three candidates of δScuti stars.     

广西伴生银矿床的地质特征与综合开发

本文叙述广西伴生银矿床的类型,地质特征及其开发利用情况。该区除独立的银矿床外,伴生银矿床可划分为8种成因类型。与铅、锌锡有关的伴生银矿床的银金属储量占伴生银总量的89.55％全区大多数生产矿山伴生争回收率低,未能得到合理的利用。为了充分利用有色金属矿床中伴生银资源和增加白银储量,应加强生产矿山物质成分,赋存状态和分布规律的研究,开展独立银矿床的预测和勘查,提高矿石中伴生银的回收率和矿山地质的研究。