Copper,Zinc and Lead Enrichments in Sediments from Guacanayabo Gulf,Cuba, and Its Bioaccumulation in Oysters,Crassostrea rhizophorae

Levels of iron, copper, zinc and lead were determined in sediments and soft tissue of the oyster Crassostrea rhizophorae collected from Guacanayabo Gulf, Cuba. Metal-to-Iron ratio in sediments shows an average enrichment for Cu (5,1), Pb (11,7) and Zn (1,3) in the last 20 years. Metal concentrations found in soft tissue of C. rhizophorae are site dependent. The average biota-sediment accumulation factors (BSAFs) obtained for Fe, Cu and Pb are less than unity in all cases, indicating that only a little fraction of Cu and Pb in the sediments is bioavailable, independently of their enrichments. Zinc has an average BSAF value of 2.4 and may represent a serious impact in the area. The concentrations of zinc and copper in some of the oysters are above typical public health recommended limits.     

Toxicity and Bioaccumulation of Lead in Marine Protozoa Communities

The toxicity and bioaccumulation of lead has been studied using marine protozoa communities developed in laboratory microecosystems. The concentrations tested were 500 and 1000 μg · L⁻¹of lead as lead acetate. The protozoan was able to bioaccumulate 27.02–504 μg Pb · g⁻¹dry weight. Bacteria also bioaccumulated lead, but always to a lesser degree than protozoa. Lead caused a significant reduction in the density of protozoa, which could be an indirect response to the cellular increase of lead. On the other hand, the toxicant did not determine a decrease in the number of bacterial cells; this could be due to their capacity to bioaccumulate a lesser amount of lead, the increase in the number of dead cells, and the elimination of their predators by the toxicant. After 120 h, a recovery of the community was observed.     

Cadmium,Zinc, Copper,and Lead in Human Renal Cortex

Analysis of cadmium and zinc in the renal cortex of 67 Swedish subjects disclosed the same dependence on age as in US subjects. In the 6–50 year age group, cadmium content and the cadmium-zinc ratio were correlated to age; thereafter, there was a decrease in cadmium and zinc and in the cadmium-zinc ratios. The increase in zinc paralleled the increase in cadmium. The difference between total zinc and the amount of zinc equivalent to the amount of cadmium provides a measure of the physiological zinc content of the cortex; this fraction, 160 ppm (based on dry weight of renal cortex), did not vary with age. In the age groups over 60, cadmium content was significantly lower in women than in men.     

Lead Bioaccumulation and Toxicity in Tissues of Economically Fish Species from River and Marine Water

Bioaccumulation of lead was determined in muscle and liver of Barbus xanthopterus, Liza abu, Barbus grypus, Acanthopagrus latus, Platycephalus indicus, Otolithes ruber exposed to lead contaminated river and marine in Khouzestan. Significant variations in metal values were evaluated using student’s t test at p < 0.05. In river fish, liver was polluted in comparison with muscle and high level was in B. xanthopterus (2.80 mg kg⁻¹ wet weight) except for B. grypus in Karkhe River (1.73 mg kg⁻¹wet weight). In marine fish, muscle was contaminated than liver and high level was in O. ruber (47.18 mg kg⁻¹wet weight) except for O. ruber in Mahshahr seaport (17.85 mg kg⁻¹ wet weight).     

Bioaccumulation of Copper, Iron, and Zinc by Pinus halepensis (Miller)

No abstract available.     

湿式消解法测定茶叶中铜、铅、锌、铁含量

[目的]探索湿式消解法在测定茶叶中铜、铅、锌、铁等元素样品前处理上的应用.[方法]样品经加混合酸在电热板上加热消解彻底后,用火焰原子吸收光谱法同时测定铜、铅、锌、铁等元素的含量.[结果]各元素标准曲线线性好,r值为0.998 0～1.000 0.相对标准偏差为0.96%～4.09%,回收率为95.42%～101.83%,标准样品的实际测定值与标准参考值相吻合.[结论]通过湿式消解法一次性处理样品,能同时测定多种元素,其方法简单、便捷,准确度和精密度都符合实验要求.     

Bioaccumulation of Iron, Zinc, Cadmium and Chromium by Juvenile Snail Limicolaria aurora J., Fed Edible Mushroom Pleurotus spp from Niger Delta, Nigeria

The effects of uptake of metals (iron, zinc, cadmium and chromium) by juvenile snail Limicolaria aurora fed edible mushroom Pleurotus spp from 3 contaminated farm sites and a laboratory grown species (control) respectively were investigated. The 120 snails were fed in plastic snaileries for 4 weeks in the laboratory. Control site was risk free. Metal uptake was low and bioaccumulation in L. aurora tissue was below FAO/WHO standard of 1 mg/kg for chromium and cadmium. Snails were considered safe for consumption.     

Variation of Lead, Cadmium, Copper, and Zinc in Aquatic Macrophytes from the Seyhan River, Adana, Turkey

No abstract available.     

Spatial and Temporal Variability of Copper, Zinc, and Cobalt in Marine Macroalgae from the Southwest Coast of India

No abstract available.     

新生儿血锌、铜、铁、镁、钙和铅水平检测

人体内的各种元素是构成机体组织和维持正常生理功能所必需的物质 ,尤其是刚出生的新生儿 ,这些元素的水平在体内起着重要的作用 ,但目前有关新生儿血液中这些元素水平的报道不多。 2 0 0 3年 2～ 5月 ,作者对 89例正常新生儿的血液进行了测定 ,以供大家参考。对象与方法1　对象　为足月顺产、单胎的健康新生儿 ,共 89人 ,其中男性 5 3人 ,女性 36人。出生体重平均为 3339克。2　方法　采集新生儿静脉血 1ml。锌、铜、铁、镁、钙采用血清 ,加入 1‰TritonX 10 0 5倍稀释 ,以Vido 2 2型美国产原子吸收分光光度仪原子吸收法进行测定 ;铅采用…     

食品水质中微量锌、锰、铜、铅示波极谱连续测定法

目的研究示波极谱连续测定食品水质中微量锌、锰、铜、铅.方法选用氨基乙酸-氯化钾-硫氰酸钾-盐酸作为底液,在该底液体系中4种微量元素在峰电位为-1.26 V、-1.55 V、-0.42 V、-0.29(VS.SCE)处产生稳定的络合吸附二阶导数极谱波,空白无峰出现.结果锌、锰、铜的检出限为0.01 mg/kg(L),铅检出限为0.02 mg/kg(L).锌、锰、铜浓度在0.01～0.8μg/g(ml)范围内与峰电流成正比,铅浓度在0.02～0.6μg/g(ml)范围内与峰电流成正比,r=0.998 3～0.9997.样品回收率96.6%～99.3%,RSD 1.3%～6.8%.结论该方法灵敏、准确、易于操作,可用于食品及水样中4种微量元素的连续测定.     

化妆品中铅、镉、铬、铜、锌、锰含量调查

为了解化妆品重金属污染情况,随机抽样了荆州市场销售的６０余种化妆品,对其Ｐｂ,Ｃｄ、Ｃｒ、Ｃｕ、Ｚｎ、Ｍｎ六种金属元素的含量进行分析。结果表明,荆州市场销售的化妆品Ｐｂ、Ｃｄ、Ｃｕ、Ｚｎ、Ｍｎ六种重金属含量范围广,不同种类,同一种为的不同厂家的化妆品中重金属含量差异较大;Ｐｂ含量超标率为６．４％,建议对其它５种重金属制定化妆品最高允许浓度。