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锌和铜
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  zn and cu
     Determination of Hair Zn and Cu Contents of Low-Selenium Residents from a Keshan Disease Area in Shaanxi Province
     陕西省克山病病区低硒居民发锌和铜含量测定
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     Our results showed that serum Cu , Zn and Cu/Zn ratio were of no help in detecting early stage cancers and in differentiating them from benign diseases but were useful in predicting stages of cancers before operation for a better choice of therapy.
     表明血清铜、锌和铜/锌比值在诊断Ⅰ、Ⅱ期消化道癌症及鉴别良、恶性疾病方面并无意义,但对术前癌症分期,进而选择更好的治疗措施是有帮助的。
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     The order of both the amount of saturated adsorption and the partition coefficients between sediments and water for heavy metals are Zn>Cu>Pb>Cd. Therefore Zn and Cu transport into sediments more easily than Pb and Cd. 
     沉积物对重金属饱和吸附量和重金属在沉积物-水两相中的分配系数的大小顺序均为Zn>Cu>Pb>Cd,表明锌和铜比铅和镉更容易迁移入沉积物.
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     n this paper,an accurate and selective methodwith 5-Br-PADAP as the complexometric indicatorfor continuous determination of Zn and Cu is de-scribed in the medium of acetic acid-sodium acetate ofpH 5.5.Theend points for both Zn and Cu are sharp.
     本文在pH5.5的乙酸-乙酸钠介质中,对以5-Br-PADAP作指示剂络合滴定法连续测定锌和铜进行了研究,对滴定的pH值及指示剂用量进行了选择,试验了锌、铜不同配比的滴定结果,研究了共存离子的干扰。
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     Determination of Trace Zn and Cu in Hair by Flaming Atomic Absorption Spectrophotometry
     火焰原子吸收光谱测定头发中的锌和铜
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  “锌和铜”译为未确定词的双语例句
     The Datian shrub species contain 12.24% crude protein,265.44 mg/kg of iron,61.43 mg/kg of manganese,26.72 mg/kg of zinc,and 17.82 mg/kg of copper,much higher than those contained in the grass species which have 9.39%,142.67 mg/kg,34.05 mg/kg,13.67 mg/kg,and 9.44 mg/kg respectively.
     灌木类饲草的粗蛋白质、铁、锰、锌和铜含量分别为12.24%、265.44、61.43、26.72和17.82mg/kg,均显著高于草本类饲草含量(依次为9.39%、142.67、34.05、13.67和9.44mg/kg)。
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     Simultaneous Determination of Zinc and Copper in Human Hair by Second Derivative Spectra
     二阶导数光谱零交叉点法同时测定人发中的锌和铜
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     Ca~(2+)? Zn~(2+) and Cu~(2+) in myocardial muscle of the contrast and experimental groups,calculated the ratio of K~+/Na~+? Mg~(2+)/Ca~(2+) and Zn(2+)/Cu~(2+),and dealt with statistics.
     方法用结扎家兔左冠状动脉建立急性心肌梗死区的模型,分别检测对照组心肌和实验组心肌中钾、钠、钙、镁、锌和铜值,然后计算K+/Na+、Mg2+/Ca2+、Zn2+/Cu2+比值并经统计学处理。
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     Spectrophotometric simultaneous determination of trace zinc and copper in aluminium alloys with 1,5-di(2-hydroxy-5-chlorophenyl)-3-cyanoformazane
     1,5-二(2-羟基-5-氯苯)-3-氰基甲光度法同时测定铝合金中微量锌和铜
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     Simultaneous Determination of Zinc and Copper in Biologic Samples by Bakpropagation Network
     反向传播网络—吸光光度法同时测定生物实样中的锌和铜
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  相似匹配句对
     ZINC
    
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     COPPER
    
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     Within the layer the copper?
     ?
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     The next is copper,magnesium,manganese,zinc and potassium.
     其次为、镁、锰、钾;
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     A STUDY ON BROILER POISONING BY COPPER/ZINC FOR EXPERIMENT
     肉鸡实验性中毒的研究
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  zn and cu
Different soil fauna differed in their microelementenrichment capability, the highest content of Mn, Zn and Cu existed in earthworm, centipede and diplopod, respectively.
      
accumulate higher amounts of Zn and Cu than their narrow-leaved counterparts.
      
The concentrations of Zn and Cu were greater in the gonads of females, whereas the concentrations of Cd, Pb, and Cr were greater in male gonads.
      
About half of the total Mn amount and 15-30% Zn and Cu is contained in geochemically mobile modes.
      
The apportioning clearly shows that Cd, Pb, Cr, Zn and Cu participate in an "anthropogenic" source profile, whereas Fe and Mn are "semi-natural".
      
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Huanren lead and zinc mineral processing plant lies in the hilly country on theChangbai mountain system in the eastern part of Liaoning province.This plant wentinto operation in 1940,but afterwards its operation was interrupted and productionwas resumed in 1951,its scale gradually enlarged.At present,four kinds of concentratesof copper,lead,zinc and iron are produced.The deposit belongs to the skarns type and in the deposit there are two types ofores:lead-zinc ore and copper-iron ore.The ores contain 0.25% Cu,0.28%...

Huanren lead and zinc mineral processing plant lies in the hilly country on theChangbai mountain system in the eastern part of Liaoning province.This plant wentinto operation in 1940,but afterwards its operation was interrupted and productionwas resumed in 1951,its scale gradually enlarged.At present,four kinds of concentratesof copper,lead,zinc and iron are produced.The deposit belongs to the skarns type and in the deposit there are two types ofores:lead-zinc ore and copper-iron ore.The ores contain 0.25% Cu,0.28% Pb,1.16% Zn:in copper-iron ore,iron content is over 20%.The plant includes the following sections:crushing and screening,grinding andclassification,flotation,magnetic separation,water supply,dewatering and tailing di-sposal.The crushing and screening section is the primary closed circuit flowsheet with threestages,the crushing product size being-12mm;the grinding and classifying section isone-stage closed-circuit flowsheet,the classifying overflow containing 40% solids,inwhich-200 mesh accounts for 55-65%.The technological flowsheet is gradually getting perfect after modification for seve-ral times and has got better metallurgical performances.The original designed flowsheetwas the preferential flotation of lead-zinc ore.In 1953,it was modified as the bulkflotation of lead-zinc ore; in 1977,the copper-lead bulk flotation flowsheet with theisofloatable feature was designed due to the increase of the copper content in theores year by year.Copper-lead bulk flotation was carried out first and then copper-leadore was separated with sulphite:lead roughing concentrate contained over 20% Zn andthe zinc removing operation had to be included in the flowsheet,the middling beingreturned to the mill for regrinding and reagent removing.The obtained results were:copper concentrate grade 28.9%,copper recovery 85.6%;lead concentrate content 63.4%,lead recovery 62.7%:zinc concentrate grade 54.5%,its recovery 90.8%.Magnetite in the flotation tailing are recovered by the use of magnetic separation.Iron concentrate with a grade of 66-68% can be obtained by fine screening,regrindingand two-stage cleanings from roughing concentrate.The plant water comes from Hunjiang and stores in high-position water sump.The final tailing contains 25% solids(by weight)and it is pumped to the tailingdam with sand pumps,which can hold tailing for 20-25 years.

本文叙述了桓仁选矿厂所处理的铅锌和铜铁两种矿石的来源、性质、工艺流程等情况,重点介绍了现行工艺流程的特点及技术指标。

The behavior of anodie dissolution of brass(Cu37Zn)was investigated in 1N Na_2SO_4 and 0.5N NaCl solutions with rotating ring-disc electrode. Partial anodic current densities of zinc and copper dissolution(i_(Zn) and i_(Cn)) of brass were measured respectively. Experimental results show that dezincification of Cu37Zn takes place in above mentioned media during anodic dissolution. Calculated dezincification factor of Cu37Zn Varies with electrode potential in 1N Na_2SO_4 solution. However, this factor does not...

The behavior of anodie dissolution of brass(Cu37Zn)was investigated in 1N Na_2SO_4 and 0.5N NaCl solutions with rotating ring-disc electrode. Partial anodic current densities of zinc and copper dissolution(i_(Zn) and i_(Cn)) of brass were measured respectively. Experimental results show that dezincification of Cu37Zn takes place in above mentioned media during anodic dissolution. Calculated dezincification factor of Cu37Zn Varies with electrode potential in 1N Na_2SO_4 solution. However, this factor does not vary significantly with electrode potential in 0.5N NaCl solution. By extrapolation of the partial polarization curves of copper and zinc for Cu37Zn, partial corros on current densities of zinc and copper have been calculated as follows: i_(corr)(Cu) i_(corr)(Zn) 1N Na_2SO-4 3×10~(-5)μA/cm~2 0.089μA/cm~2 0.5N NaCl 1.6μA/cm~2 3.6μA/cm~2 Experimental results also show that the rate of anodie dissolution of brass is mass-diffusion-controlled in both investigated media.

本文采用旋转圆盘——圆环电极研究了黄铜(Cu37Zn)在1N Na_2SO_4及0.5N NaCl溶液中的阳极溶解行为。分别测出了黄铜阳极溶解时铜和锌的阳极溶解分电流密度。实验结果表明,Cu37Zn在上述两种介质中阳极溶解时均存在脱锌现象。在1N Na_2SO_4溶液中测得的脱锌系数强烈地依赖于阳极电位,而在0.5N NaCl溶液中,其脱锌系数与阳极电位的关系不明显。由黄铜中铜和锌的阳极极化曲线外推计算出了黄铜阳极溶解时锌和铜的腐蚀分电流密度,在1N Na_2SO_4溶液中分别为0.089及3×10~(-5)μA/cm~2,在0.5N NaCl溶液中分别为3.6及1.6μA/cm~2。实验还表明,黄铜在上述介质中的阳极溶解过程由扩散步骤所控制。

Zinc and copper in blood serum could be determined simutaneously by anodic stripping voltammetry with, a mercury-coated silver electrode. The amount of serum needed was only as small as 0.1 ml. After the digestion process by using perchloric acid at 250°-260℃, 5ml ammonia(0.6M)-ammonium acetate (0.1 M) solution (pH 9.0-9.6)were added. Nitrogen gas was passed through for stirring and deaeration.The measurements of zinc and copper were completed by plating for 30 sec at -1.6V (vs silver/silver cholride electrode)....

Zinc and copper in blood serum could be determined simutaneously by anodic stripping voltammetry with, a mercury-coated silver electrode. The amount of serum needed was only as small as 0.1 ml. After the digestion process by using perchloric acid at 250°-260℃, 5ml ammonia(0.6M)-ammonium acetate (0.1 M) solution (pH 9.0-9.6)were added. Nitrogen gas was passed through for stirring and deaeration.The measurements of zinc and copper were completed by plating for 30 sec at -1.6V (vs silver/silver cholride electrode). The derivative I vs E curve was recorded from -1.6 V to -0.2V at scan rate of 100mv/sec. Stripping peaks of zinc and copper occurred at -1.1 V and -0.4V, respectively.This method proved itself a better reproducibility. Calibration curves of zino and copper in the range of 0.06μg to 0.3μg showed linear relation. The recovery rate of 0.08μg zinc was 90% and copper, 104%.Our studies showed that interference due to formation of copper-zinc intermetal-lic on the mercury-coated silver electrode was eliminated. In 0.1ml serum, iron (Ⅲ), lead and cadmium did not affect the analytical results.By using this simple rapid method, the concentration of zinc and copper in blood serum of 261 healthy persons were determined. The results are: Zino 137μg/100ml serum, copper 107μg/100ml serum (mean value), zinc/ copper ratio: 1.32/1.

本文研究了用银棒汞膜电极阳极溶出伏安法同时测定人血清中的微量锌和铜,血清取样量仅需0.1ml,经高氯酸消化处理后,在5mlNH_3(0.6M)一NH_4OAC(0.1M)辅助电解质中,置电位于-1.6V处电积后溶出,可同时记录锌和铜的溶出峰高。本法可排除锌和铜的相互干扰,具有较好的重现性和准确性,为研究微量元素Zn/Cu比值与人体健康的关系,提供快速、简便的分析方法。

 
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