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铅和铜
相关语句
  pb and cu
    Pb and Cu Levels in Samples of Tea Marketed in Beijing
    北京市售茶叶中的铅和铜含量水平分析
短句来源
    Effect of Processing on the Pb and Cu Pollution of Tea
    加工过程对茶叶铅和铜污染的影响
短句来源
    The effect of processing on the Pb and Cu pollution of tea was studied in this paper.
    研究了初制加工对茶叶铅和铜污染的影响。
短句来源
    Results showed that tea processing was one of the main pollution sources of Pb and Cu. The extent of pollution was varied with the working procedure, machine and its metal composing.
    结果表明,茶叶加工是铅和铜污染的重要途径之一,但污染的程度因工序、作业方式和机具的金属组分不同而异。
短句来源
    Therefore, keeping clean in workshop and regulating the metal constitution of rolling machine could reduce the Pb and Cu pollution during tea processing.
    因此,保持加工场所的清洁卫生和调整揉捻机揉筒和揉盘的金属组成是降低茶叶加工过程中铅和铜污染的有效途径。
短句来源
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  “铅和铜”译为未确定词的双语例句
    The Sample Preparation for Determination of Pb,Cu in Milk Powcer by High Temp.Ashing AAS
    高温灰化—原子吸收萃取测定奶粉中的微量铅和铜,样品处理方法的研究
短句来源
    The pollution sources were quite different between Cu and Pb. Cu pollution was mainly from rolling machine and the Cu content of the machine. Cu pollution from rolling procedure accounted for 90% of total one.
    茶叶加工过程中铅和铜污染的来源不同,铜主要来自铜质揉捻机,该工序污染的铜约占茶叶加工铜污染总量的90%以上;
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  pb and cu
grayanus began to accumulate Pb and Cu after certain threshold concentrations of these metals (60 and 150 μg/g respectively) in fine fractions of sediments was reached.
      
Presl heavy metals species (Cd, Pb and Cu) were assayed by differential pulse anodic stripping voltammetry and diffusive gradient in thin films.
      
The results showed that the competition affected the behavior of heavy metal cations in such a way that the soils adsorbed less Cd and Hg, and more Pb and Cu with increasing total metal concentrations, regardless of the molar concentration applied.
      
As the applied concentrations increased, Pb and Cu adsorption increased, while Cd and Hg adsorption decreased.
      
The results suggest that Hg and Cd have higher mobility associated to the lower adsorption and that Pb and Cu present the opposite behavior.
      
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The lead and copper in sample of cigarette paper were dissolved in HNO3 and HClO4, then the lead and copper in the sample can be determined by acetylene-air-atomic absorption spectrometry at λ=283. 3,324. 8nm. The equipment is HITACHI Z-8200. The method is simple, rapid, convenient and accurate.

卷烟滤嘴棒用的纸样品经硝酸、高氯酸湿法消化,在乙炔-空气火焰下,于波长283.3、324.8nm处,用原子吸收光谱法测定铅和铜的百分含量。方法简便、快速,结果准确。

A methodology for the determination of Cd,Pb and Cu by differential pulse anodic stripping voltammetry (DPASV) using a rotating glassy carbon/mercury film electrode in marine organisms is proposed. Using the differential pulse mode , half-wave peak potentials as E1/2 were -0.5,-0.7,and -0.1 V for cadmium (Cd), lead (Pb), and copper (Cu), respectively. Results have been analyzed by calibration and standard addition methods. The recoveries of standard addition were 96.9~108.3 %, 95.1~113.3 %, and 105.0~115.4 %...

A methodology for the determination of Cd,Pb and Cu by differential pulse anodic stripping voltammetry (DPASV) using a rotating glassy carbon/mercury film electrode in marine organisms is proposed. Using the differential pulse mode , half-wave peak potentials as E1/2 were -0.5,-0.7,and -0.1 V for cadmium (Cd), lead (Pb), and copper (Cu), respectively. Results have been analyzed by calibration and standard addition methods. The recoveries of standard addition were 96.9~108.3 %, 95.1~113.3 %, and 105.0~115.4 % respectively .The liner domain ranges were 0.03~20.94 μg·L-1 for Cd , 1.00~78.28 μg·L-1 for Pb, and 0.00~47.41 μg·L-1 for Cu. The studies have shown that the method is a rapid, reproducible, accurate and sensitive determination of these elements in marine organisms.

使用同步镀汞微分脉冲阳极溶出伏安法(DPASV)对水产品中镉、铅以及铜元素进行测定。镉、铅和铜的半波电位分别为:E1/2=-0.5,-0.7以及-0.1V。由标准加入法计算含量,平均回收率分别为:96.9%~108.3%、95.1%~113.3%以及105.0%~115.4%。线性范围分别为0.03μg·L-1~20.94μg·L-1,1.00μg·L-1~78.28μg·L-1以及0.00μg·L-1~47.41μg·L-1。方法快速、准确和灵敏。

The effect of processing on the Pb and Cu pollution of tea was studied in this paper. Results showed that tea processing was one of the main pollution sources of Pb and Cu. The extent of pollution was varied with the working procedure, machine and its metal composing. Almost every working procedure, including fresh leaves spreading out or withering, deenzyming, rolling or cutting, fermentation and drying could increase the Pb and Cu concentrations of tea. However, rolling and spreading out were the most important...

The effect of processing on the Pb and Cu pollution of tea was studied in this paper. Results showed that tea processing was one of the main pollution sources of Pb and Cu. The extent of pollution was varied with the working procedure, machine and its metal composing. Almost every working procedure, including fresh leaves spreading out or withering, deenzyming, rolling or cutting, fermentation and drying could increase the Pb and Cu concentrations of tea. However, rolling and spreading out were the most important procedures resulting in Cu and Pb pollution, respectively. With the increase of rolling pressure and time, the Cu and Pb concentrations steadily increased. Due to different procedures, especially the rolling pressure and time, the Cu and Pb concentrations of made teas were different, oven dried and roast green tea were the highest, followed by CTC (Crushing, Tearing, Curling) and Orthodox black tea, almost no change in Longjing tea processing. The pollution sources were quite different between Cu and Pb. Cu pollution was mainly from rolling machine and the Cu content of the machine. Cu pollution from rolling procedure accounted for 90% of total one. Pb pollution was mainly due to dust, which came from unclean ground and air in the workshop. Therefore, keeping clean in workshop and regulating the metal constitution of rolling machine could reduce the Pb and Cu pollution during tea processing. In addition, clearing the mature leaves and tea dust away after tea primary processing also could decrease the Pb concentration of tea.

研究了初制加工对茶叶铅和铜污染的影响。结果表明,茶叶加工是铅和铜污染的重要途径之一,但污染的程度因工序、作业方式和机具的金属组分不同而异。初制加工的各个工序都有可能使茶叶铅和铜含量提高,其中铜增幅最大的工序是揉捻,铅增幅最大的工序是摊放;随着揉捻压力增大、时间延长,茶叶铜和铅含量逐渐提高。由于加工方式,特别是揉捻的时间和压力不同,导致不同茶类有明显的区别,烘青和炒青的污染程度较重,红碎茶和工夫红茶次之,龙井茶几乎没有污染。茶叶加工过程中铅和铜污染的来源不同,铜主要来自铜质揉捻机,该工序污染的铜约占茶叶加工铜污染总量的90%以上;铅的污染则主要来自尘土,其次是揉捻机中的铅,摊放在不清洁的地上会导致茶叶铅含量成倍提高。因此,保持加工场所的清洁卫生和调整揉捻机揉筒和揉盘的金属组成是降低茶叶加工过程中铅和铜污染的有效途径。另外,对初制加工的茶叶,清除其中的黄片和茶末对于降低茶叶铅含量也具有重要的作用。

 
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