Fluoride exposure in the endemic fluorosis area of Guizhou, China     

Weiwei LI Yuegang TANG Shifeng DAI 《中国地球化学学报》2006,25(B08):70-70

The dental and skeletal fluorosis is highly prevalent in Zhijin, Guizhou, especially at Hualuo Village, Hehua Village and Majiazhuang Village. The contents of fluorine in coal, clay used for coal combustion, mixed fuel of coal and clay, corn, and chili from households of the three villages were determined by the pyrohydrolysis-fluorine ion-selective electrode method. The average contents of fluorine in the above samples respectively are 237 mg/g, 2262 mg/g, 828 mg/g, 1419 mg/g, and 110 mg/g. The clay used for coal combustions is the main fluorine source of endemic fluorosis and the inferior coal and weathered coal are the secondary source of fluorine. During the combustion of mixed fuel of coal and clay, about eighty percent of fluorine was volatilized, approximately two thirds of which was from the clay and the other one third from the coal. The occurrence of fluorine in clay used for coal combustion is closely related to apatite and hornblende. The contents of fluorine in corn and chili, dried by coal-clay mixed fuel are about 1400 and 73 times higher than the permitted level of fluorine in foods according to the Chinese Standard. It is worth paying attention to the high-fluorine indoor surroundings, such as coal, clay, corn, and chili, particularly ash from boiler bottom with the fluorine content of 15738 μg/g. Besides the technologies of fluorine fixation during the combustion,  相似文献   

The lava lake-induced volcanic plume at Nyiragongo Volcano （DRC）： Environmental effects on crop and population     

Orlando Vaselli Franco Tassi Dario Tedesco Nisi Barbara Capaccioni Bruno Mapendano Yalire 《中国地球化学学报》2006,25(B08):71-72

The Nyiragongo volcano is located in the Virunga volcanic chain （Western Branch Rift, Eastern African Rift System）. On January 17-18, 2002 a NS-oriented fracture network quickly propagated down-slope up to 16 km from the crater and two of the several lava flows emitted reached the city of Goma （about 500000 inhabitants）. On May 2002 the volcanic activity resumed in the main crater with the formation of an active lava lake, which produced a volcanic plume mainly displaced west towards by the dominant winds. TOMS data suggest a release of SO2 of up to 60000 tons per day with relevant amounts of HF, HC1 and CO2. About 50000 people living in the villages around the western flank of Nyiragongo were forced to use rainwater, having no direct access to drinkable water Furthermore, crops and plants located in the western sector lie below the main direction of the volcanic plume. In order to evaluate the effects on the environment and public health caused by the Nyiragongo degassing system, rain waters, ashes, scorias and Pelee＇s hairs have been collected in a span of time of more than three years from different sites： （1） Nyiragongo crater;  相似文献   

Relationship between fluorine content in drinking water and oral health in some big cities in China     

Binbin WANG Baoshan ZHENG 《中国地球化学学报》2006,25(B08):80-80

Background： Fluorine is an important element to human health. Overloading of fluorine may cause dental and/or skeletal fluorosis, while in fluorine deficiency distracts, fluoride drinking water supply or other methods of fluoridation may greatly reduce the ratio of dental caries of local residents. The benefit of drinking water fluoridation has been widely accepted as a public sanitation measure in most western countries, but in China it faces big challenges. Method： Investigation of oral health and fluorine level in drinking water, main food and urine in some big cities of China. Result and conclusion： （1） Fluorine content in drinking water in 70% of the whole research cities is lower than 0.3 mg/L, and in 90% of the research cities, it is lower than 0.5 mg/L. （2） Fluorine concentrations in main foodstuff of respective cities in China were low and did not have too much difference. （3） Drinking water was the main source of fluorine intake for Chinese residents. （4） With the data of the epidemiological research by NCOH in 1995, in the range of fluorine content in drinking water below 1.0 mg/L, the ratio of dental caries and DMFT decreases with the increase of fluorine concentration. The relation between fluorine concentration in drinking water and dental index did not have a good linear relationship.  相似文献   

Analysis of F, Al, Mn, Zn, Fe, Cu, Ca and Mg concentrations in brick teas from main producing areas in China     

Xiaoyu ZHAO Wuyi WANG Hairong LI Fujian FENG Lizhen WANG 《中国地球化学学报》2006,25(B08):80-81

Brick-tea-type fluorosis is a peculiar endemic disease in China, which had been discovered in minority areas of western China since 1980, and distributed mainly in Tibet, Inner Mongolia, Gansu, Xinjiang, Qinghai and parts of Sichuan Province. The prevalence rate of fluorosis in Tibetan and Mongolian nationality people was higher. Epidemiological investigation showed that fluorosis morbidity and degrees were different in different brick-tea drinking areas, and it was probably caused by drinking various kinds of brick tea from different regions. Therefore, we collected 33 samples of brick tea from six provinces where minority nationalities were accustomed to drinking a large quantity of brick tea. F concentrations were determined by the combustion hydrolysis-ion selective electrode method. The results showed that among the brick teas, the F concentrations ranged from the minimum 74.1 mg/kg in Yunnan Province to the maximum 991.2 mg/kg in Sichuan Province. Besides, there was a great difference among the various kinds of brick tea, and F concentrations decreased in the order of Kang brick tea, Green brick tea, Black brick tea, Mi brick tea, Fu brick tea, Chitsu ping tea, Puerh tea, and Tuo tea. The average F concentration in brick teas was 431.92 mg/kg.  相似文献   

单扫描极谱法测定地质样品、土壤和蔬菜中的氟   总被引：1，自引：0，他引：1  

陈文  汪模辉  李锡坤  张玉玉  刘静凯 《矿物岩石》2006,26(1):105-109

采用三电极系统(工作电极:滴汞电极;参比电极:甘汞电极;辅助电极:铂丝电极),在pH=4.9的六次甲基四胺缓冲溶液中,利用P r3 -ALC-F-三元络合体系及单扫描极谱法测定地质样品、土壤及生物样品中微量氟,该方法操作方便、快速、灵敏,测量的回收率为96%~99%。其起始电位为-0.20 V(vs.SCE),峰电位在-0.58 V(vs.SCE)左右,线性范围为1.0×10-6m o l/L~4.0×1-0 5m o l/L,检出限为:8.0×1-0 7m o l/L。  相似文献   

关于茶、稻中铅、氟限量标准的讨论     

郦逸根  董岩翔  朱有为  林子敬  郑洁 《上海国土资源》2006,(2):26-29,66

对浙江省农业地质环境调查有关农产品安全性资料成果,分析在茶、稻中的铅、氟含量水平及安全性,并探讨了影响农产品安全的原因,进行了茶叶和水稻中铅、氟限量标准的讨论,认为国内对食品卫生标准制定趋于偏紧。参照日本、加拿大的茶叶氟元素限量标准,提出浙江省茶、稻的铅、氟元素限量标准。  相似文献   

莲花山矿段磷矿石P2O5与F的相关性研究     

徐少康  王磊  王宇  刘辰炯 《化工矿产地质》2020,42(2):106-110

莲花山磷矿为大型生物化学沉积型磷矿,伴生有一定量的氟,为了查明磷与氟的关系,通过对化学数据分析等的综合处理,对P_2O_5与F的相关性和原因进行了研究。结果表明,P_2O_5与F呈十分显著的正相关性,数学模型为y=0.09x-0.17;矿石中的氟主要赋存于磷灰石中,成矿介质在形成演化过程中,氟与磷是同步富集的。在找矿实践中,如果出现氟异常,则预示可能存在工业磷矿层;进行氟资源量估算时,应考虑矿石P_2O_5品位,以使估算结果尽可能接近实际情况。  相似文献   

微生物参与下高氟区沉积物中氟的迁移行为          下载免费PDF全文

张玉贤  甘义群  周肖瑜  姜翠杰  高旭波  李成城 《地质科技通报》2022,41(3):228-235

氟是自然界广泛分布的非金属元素,也是人体必须的微量元素之一。环境微生物作为自然界中物质迁移的主动力之一,积极地参与着多种元素的水文生物地球化学循环。研究微生物参与下沉积物中氟的释出行为,对深入理解环境氟迁移行为具有重要意义。以山西运城高氟区沉积物样品为代表,采用野外沉积物调查采集、室内环境地球化学分析和微宇宙培养实验等研究手段,从环境生物地球化学作用的角度探讨了微生物介导下沉积物中氟的迁移释出行为。研究证明,高氟区沉积物总氟质量分数介于206.2~781.0 mg/kg之间,主要含氟矿物为长石、云母、方解石、绿泥石、角闪石等。培养条件下,溶液中的氟质量浓度与微生物生长曲线呈现良好的一致性;在培养初期,溶液中的氟质量浓度迅速上升,而后逐渐缓和,14 d后呈下降趋势。其中,黏土类沉积物的释氟量较大,砂土类沉积物释氟量较小。有、无碳源对照培养说明,沉积物中一定量的碳源可被微生物代谢利用,但碳源不是影响微生物在此环境中作用的主要因素。研究证明,原生微生物代谢活动可以显著促进沉积物中氟的迁移释出,微生物作用下不同岩性沉积物中氟的释出特征也有显著的差异,本研究工作有助于进一步丰富环境氟循环的理论认识。   相似文献   

微量元素与人体健康     

《西部资源》2014,(3):73-73

<正>人类在与病魔的抗争中,发现有一类疾病与人体一些微量元素的缺乏或过剩有关。例如。人体缺钙,容易出现骨质疏松,患上骨质增生或佝偻病;缺锌,特别是儿童缺锌,将出现内分泌失调、发育不良或导致侏儒症;缺铁,会出现贫血;缺碘,会产生甲状腺肿。相反,当人体某种微量元素过高时,将产生微量元素中毒症状,甚至诱发某些癌症。例如砷中毒、硒中毒、氟中毒、镉中毒、汞中毒、铅中毒可导致肺癌、皮肤癌、食道癌等疾病。可见  相似文献   

辽宁丹东花岗岩区打出地热水     

曹中夫  王帅 《西部资源》2014,(5):61-61

<正>近日,辽宁地质七队在丹东五龙山风景区西侧成功打成一眼温泉井,成井深度2,127米,水温46摄氏度,日出水量610吨。经检测,该温泉水含有多种矿物元素,其中氟含量达到国家理疗矿水命名标准,属氟理疗热矿泉水。技术人员称,该井属增温、对流复合型深井温泉水,区内地热流体储热层主要为印支期花岗岩中的热储构造带,  相似文献