海洋沉积物孔隙水中阴阳离子含量的离子色谱法分析方法   总被引：2，自引：0，他引：2  

葛璐  杨涛  杨競红  蒋少涌 《海洋地质与第四纪地质》2006,26(4):125-130

分别采用Metrosep A Supp4-250型阴离子柱和Metrosep C 2-150型阳离子柱,以1.8 mmol/L Na2CO3 1.7 mmol/L NaHCO3和4 mmol/L酒石酸 0.75 mmol/L吡啶二羧酸为阴阳离子淋洗液,用离子色谱仪来测定海洋沉积物孔隙水中阴离子Cl-、Br-和SO42-浓度和阳离子Na 、NH4 、K 、Ca2 、Mg2 的浓度。特别是针对高Cl-和高Na 背景下Br-和NH4 的测定做了专门分析,得到了较理想的结果,建立了一套离子色谱法测定海洋沉积物孔隙水中常见的阴阳离子含量的实验方法。  相似文献   

黄海北部降水中氟的浓度变化   总被引：1，自引：0，他引：1       下载免费PDF全文

董峻  王剑  吕翔  张经 《海洋科学》1993,17(3):43-47

1988～1992年连续采集了黄海西北部的大气降水,分析样品中的氟而得到的80多个数据显示出大气降水中氟的平均浓度低于中国北方主要河流的氟平均浓度。在冬季,氟的浓度较其他季节高,这可能和降雨量减少以及人为因素等密切相关。目前还难以估算出人为因素对氟在降水中化学行为的影响程度,但数据显示出人口密集地区降水中氟的浓度明显高于人口稀疏的自然地带。  相似文献   

我国高氟水形成特点的主要影响因子及降氟方法     

范基姣  佟元清  李金英  王立新  李戎  刘志勇 《地质勘探安全》2008,15(1):14-16

以华北平原和关中盆地数据为例,分析我国高氟水形成特点的主要影响因子为背景岩石、蒸发作用、地温环境以及人类活动,并针对我国高氟水特点,提出防止氟中毒的方案。  相似文献   

中国南方离子吸附型稀土矿床成矿类型及其母岩控矿因素探讨     

付伟  赵芹  罗鹏  李佩强  陆济璞  周辉  易泽邦  许成 《地质学报》2022,96(11):3901-3923

传统认为中国南方的离子吸附型稀土矿床可划分为以“足洞式”为代表的重稀土型和以“河岭式”(或“花山式”)为代表的轻稀土型两种矿化类型。然而，近年来发现的许多矿床(如清溪、寨背和馒头山等)的赋矿风化壳中出现了轻稀土矿与重稀土矿并存现象，表现出特殊的“上轻下重”双层矿体结构。这指示了除重稀土型和轻稀土型之外，还存在着轻重稀土共生型的过渡类型。本研究通过对三种不同成矿类型的若干典型矿床系统对比，指出成矿类型的多样性与母岩性质密切相关，尤其是母岩的稀土元素地球化学和稀土载体矿物属性是制约成矿类型变化的关键因素。统计数据表明，从重稀土型→轻重稀土共生型→轻稀土型，成矿母岩的全岩稀土总量变化不大(ΣREY: 200×10-6~450×10-6→200×10-6~500×10-6→200×10-6~800×10-6)，但轻重稀土配分值出现较显著的区间性差异(ΣLREE/ΣHREY: 02~1→1~5→2~10)。与之同时，母岩中能为离子相稀土提供物源且具有重稀土配分属性的稀土副矿物类型和数量明显减少，这与全岩稀土元素地球化学特征中重稀土分量占比的降低趋势也互相匹配。该结果指示，以往认为重稀土配分母岩形成重稀土矿床、轻稀土配分母岩形成轻稀土矿床的传统观点需要外延，即一部分具有低度轻稀土配分属性(1＜ΣLREE/ΣHREY＜5)且含有丰富易风化稀土副矿物的母岩还可能形成轻重稀土共生型矿床，该认识可为今后离子吸附型稀土矿床勘查工作提供新的找矿依据。  相似文献   

我国地方性氟病的地球化学问题   总被引：18，自引：0，他引：18  

刘东生陈庆沐  余志成袁芷云 《地球化学》1980,(1):13-22

Endemic fluorine disease is a chronic fluorine poisoning caused by high level of fluorine in drinking water or foods. Incidence of this disease has been knowu in many parts of the world. In China its occurrence has been observed in the Northeast, Northwest, Southwest and some other localities. Investigation shows that it is closely related to geochemical environment: Major fluorine sources in nature include fluorinerich volcanic rocks, calcareous dolomites, phosphorus-bearing rocks/loess and Quarternary loose sediments. Under special conditions fluorine is concentrated in ground water or soil and seeks its way into human body through diet. Areas With high fluorine concentration responsible for the fluorine disease can be classified into four types, depending on characteristics of geochemical environment: (1) Arid and semiarid calcium-rich soda saline areas; (2) Semiarid, alternatively marine-terrestrial strata with a high degree of salinity; (3) Semihumid iron- and aluminum-rich intermediate-acid soils; (4) Localities where fluorine-rich rocks or deposits are developed;and those with high fluorine content as a result of industrial pollution. Based on medical statistics and chemical analyses, of water, soil, food and other related samplcs,this work will provide a scientific baekground for the prevention and control of fluorine disease.  相似文献   

A study of fluoride occurrence in groundwater and dental fluorosis in Nathenje, Lilongwe, Malawi     

《中国地球化学学报》2006,25(B08):60-60

  相似文献   

Fluorosis and arsenicosis： An update     

Lakshmi Narasimharao Kodali Jagadiswararao Ramayanam 《中国地球化学学报》2006,25(B08):65-65

Endemic fluorosis, caused by excess fluoride in water, is widespread in the arid and semiarid tracts of India. This disorder is of recent origin and developed due to certain faulty water management practices. After Eager reported ‘dental mottling＇ among emigrants from Pozzuli in Italy in 1901, several such reports came from all over the world. From 3 works published independently from Pennsylvania, Arizona and South Africa in 1931, it was known that this disorder is caused by drinking water containing over 1 mg/L fluoride during formation of permanent teeth among children.‘Skeletal fluorosis/Osteofluorosis＇, affecting bones and joints among adults was reported by Moeller and Gudjonsson in 1932 due to accumulation of fluoride in hard tissues by drinking water with over 7 mg/L fluoride for several years. In course of time fluorosis has been reported in over 22 countries from all over the world. Fluorosis spreads now among 67 million people in the entire arid and semiarid tracts of India. The work of National Institute of Nutrition of India at Hyderabad in 1977 revealed the spread of endemic ‘genu valgum＇ （knock-knee） crippling lower limbs right from childhood in association with fluorosis in most parts of India. Although preliminary work revealed that genu valgum is caused by drinking waters poor in calcium and rich in molybdenum, efforts these disorders by supplying low-fluoride water should be taken up to know its exact cause to the communities could not so eradicate The governmental efforts to eradicate the problem.  相似文献   

Brick tea and its health impact     

Hairong LI Qinbin LIU Wuyi WANG Xuehui LIU Hailong LI Shuhai LI Xiaoyu ZHAO Lizhen WANG 《中国地球化学学报》2006,25(B08):73-74

Tea bush is one of the plants cultivated in acidic soil, and is a typical hyper-accumulator of F and Al. Brick tea is a kind of brick-formed tea compressed using the older and coarse leaves and branches of tea trees. Brick tea mixed with milk is drunk as a daily indispensable beverage for Mongols, Ewenki, and other minority nationalities in the pastoral and semi-pastoral areas of Northwest China. It is reported that drinking brick tea can result in dental and skeletal fluorosis due to the high F content in it. Because Alzheimer＇s disease （AD） is related with Al in human brain, and Al has potential toxicities for skeletal and neural systems,  相似文献   

极谱测氟法在天然水和化妆品中的应用   总被引：1，自引：0，他引：1  

张蓉 《云南地质》2005,24(3):317-320

本文提出使用Zr4 ———钍试剂极谱法测定氟,具有灵敏、准确、快捷等特点。  相似文献   

新疆绿色电气石颜色成因研究   总被引：5，自引：0，他引：5       下载免费PDF全文

王进军陶晓风  王武军 《岩石矿物学杂志》2005,24(4):319-323

新疆绿色电气石颜色成因比较特殊,为了更好地了解其颜色的形成,主要采用化学分析、吸收光谱、穆斯堡尔谱等测试手段对绿色电气石颜色成因进行研究。化学分析结果显示每个样品中均含有少量不同过渡元素离子,如Fe2 、Ti4 、Cr3 等,影响着绿色的形成;利用吸收光谱测试方法确定了致色离子的吸收带位置及主要离子的种类、价态,并根据化学成分计算出相应的化学式,利用穆斯堡尔谱确定了铁离子在晶体中的占位。综合运用上述测试方法,确定了绿色电气石的颜色成因。  相似文献