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以水体甲基汞不同浓度（μｇ／Ｌ）分别染毒鲤鱼２４小时和１周。实验结果表明：在浓度高于５０μｇ／Ｌ染毒２４小时和浓度２０μｇ／Ｌ染毒１周时，多数染毒鱼的血浆Ｋ＋和Ｍｇ２＋浓度增高，Ｎａ＋和Ｃｌ－浓度下降，ＰＯ３－４值变化不明显。血浆Ｃａ２＋浓度仅在２００μｇ／Ｌ染毒２４小时和高于４０μｇ／Ｌ染毒１周时，染毒鱼的血浆Ｃａ２＋出现极显著下降。甲基汞量高于１００μｇ／Ｌ染毒２４小时和８０μｇ／Ｌ染毒１周，染毒鱼的血浆渗透压呈明显下降趋势。鳃线粒体Ｎａ＋－Ｋ＋－ＡＴＰａｓｅ活性仅在染毒２４小时浓度为２５μｇ／Ｌ和５０μｇ／Ｌ剂量时受到抑制。甲基汞还引起了血糖含量的明显增高。 相似文献
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Gharaei A Esmaili-Sari A Jafari-Shamoshaki V Ghaffari M 《Fish physiology and biochemistry》2008,34(4):473-482
Recently, there have been reports of increasing amounts of mercury (Hg) in muscles of beluga (Huso huso, Brandet 1869) in the Caspian Sea which exceeds its guideline level for food in the UK. Our intensive effort was to investigate
the effects of dietary methylmercury (MeHg) on Beluga bioenergetics. Beluga juveniles were fed with four diets containing
MeHg (control: 0.04 mg kg−1; low: 0.76 mg kg−1; medium: 7.88 mg kg−1; and high: 16.22 mg kg−1) for 70 days. There were significant differences in food consumption among the treatment groups. After 42 days, all individuals
of the high dose died. After 35 and 70 days, all treatment groups (low, medium and high) showed a significant decline in their
growth rate, unlike the control group. They also showed considerable lower specific growth rates (SGR) comparing to the control
group. All treatment groups assimilated the dietary MeHg into their muscle tissue in a dose-dependent manner. Assimilation
percent was significant among the treatment groups at days 35 and 70, but it was lower in the first 35 days than in the second
35 days. The data obtained from the dietary MeHg concentration and bioaccumulation rates were modeled for better natural resources
management of the Caspian Sea. 相似文献
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汞（尤其是甲基汞）易在鱼体内富集,进而危害人类健康。为了解珠三角地区淡水鱼类的甲基汞积累现状,本研究对该区域内常见的养殖和野生鱼类进行了采样和甲基汞测定,并探讨了影响鱼类甲基汞积累差异的原因。结果发现,珠三角地区鱼类甲基汞含量总体较低,均未超过我国水产品食用安全标准,其中养殖鱼类肌肉甲基汞含量为0.26-331 ng g-1 dw,平均含量为62 ng g-1 dw;野生鱼类肌肉甲基汞含量为0.71-1 006 ng g-1 dw,平均含量为111 ng g-1 dw,养殖鱼类甲基汞含量显著低于野生鱼类。鱼类甲基汞累积主要受食物组成及食物甲基汞浓度影响,饲料甲基汞含量是决定养殖鱼类甲基汞水平的关键性因素。食用该地区鱼肉的甲基汞摄入水平总体较低,其中食用野生鱼类的甲基汞摄入水平较养殖鱼类高,食用野生鳜（Siniperca chuatsi)）存在甲基汞暴露风险。 相似文献
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稻米对甲基汞的累积危害居民身体健康。本文通过施用厌氧腐熟有机肥的盆栽试验,探讨有机肥施用对水稻中汞-甲基汞累积的影响。结果表明,有机肥施用水稻土中甲基汞含量显著增加,对照(10.43μg/kg)1%豆饼粉肥(16.80μg/kg)1%鱼粉肥(24.10μg/kg)2%豆饼粉肥(33.53μg/kg)2%鱼粉肥(38.46μg/kg),可能是施加有机肥后,增加了土壤微生物数量,提高了酶活性,导致水稻土中甲基汞含量增加。有机肥施用后,水稻不同部位总汞累积差异显著,根部最高(2 812.83μg/kg),其次是糙米(336.78μg/kg)和茎叶(300.44μg/kg)。有机肥施用后,水稻不同部位累积甲基汞的能力不同,表现为糙米(180.06μg/kg)根(59.71μg/kg)茎叶(38.97μg/kg)。不同有机肥的施用均增加籽粒中甲基汞的含量,与对照相比,各处理增加量表现为1%豆饼粉肥(16.1%)1%鱼粉肥(19.3%)2%豆饼粉肥(41.5%)2%鱼粉肥(57.9%)。同时稻米中甲基汞含量与水稻土中甲基汞含量呈正相关关系。有机肥施用增加汞污染土壤水稻中汞与甲基汞累积,其可为合理施肥提供科学依据和理论指导。 相似文献
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The aim of the present study was to investigate concentrations of total mercury (THg) and methylmercury (MeHG) in the common
carp from Czech ponds of Rožmberk, Spolsky, Nezmar, and Velky Bědny. Seven common carps (Cyprinus
caprio) from each of the ponds were caught. Muscle tissue, the liver, and the soft and hard roe were used for the tests. Total mercury
and methylmercury were found in all the muscle tissue samples examined. Detection limits for total mercury and methylmercury
determination methods were 0.001 mg kg–1 and 0.013 mg kg−1 respectively. Methylmercury levels in the liver and gonads were below the method’s limits of detection. THg and MeHg concentrations
in muscle tissues were 0.018–0.063 mg kg–1 w.w. and 0.019–0.063 mg kg–1 w.w. respectively. MeHg made up 90–100% of THg in muscle tissues. Total mercury and methylmercury concentrations were significantly
(P < 0.05) higher in fish from the Spolsky pond than from the Nezmar pond. MeHg/THg ratios were significantly (P < 0.05) higher in fish from the Rožmberk, Spolsky and Nezmar ponds compared with fish from the Velky Bědny pond. 相似文献
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目的研究浙江地区中华绒螯蟹甲基汞的分布特征与食用风险。方法 在浙江主要养殖地区的养殖场设点抽样,利用LC-AFS6000液相色谱原子荧光联用仪检测样品可食部分中的甲基汞含量。利用甲基汞周可摄入量(Provisional Tolerable Weekly Intake, PTWI)和参考剂量 (Reference Dose. RfD)进行甲基汞暴露健康风险指标计算,进行分析食用风险评估。结果 中华绒螯蟹的蟹肉中的甲基汞含量明显高于蟹黄中的甲基汞含量,蟹肉中的甲基汞含量远小于0.5 mg/kg,吴兴乔溇太湖蟹肌肉中甲基汞含量最高达到0.043 mg/kg。结论 浙江地区中华绒螯蟹符合国家相关要求,百姓可以放心食用,同时建议国家标准中有关甲壳类动物中重金属甲基汞限量做更细的区分和说明。 相似文献
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