麻烦有哪位英语高手能帮忙翻译一下英文文献,是有关化学的!非常感谢!
INTRODUCTIONConcernsoverthelevelsofIfoundinmilkhaveemergedgloballyduringthepast25yr.S...
INTRODUCTION
Concerns over the levels of I found in milk have emerged globally during the past 25 yr. Studies conducted in several countries suggest that there may be a public health concern caused by the presence of excessive amounts of this trace element in both raw and processed milk supplies. Some jurisdictions have, as a direct result of these concerns, established legislation that regulates the maximum allowable limit for I in milk. Iodine is required for synthesis of various thyroid hormones that are critical for growth, reproduction, thermoregulation, calorigenesis, intermediary metabolism, protein synthesis, and neuromuscular function (Fisher and Carr, 1974).
Some methods measure total I, and others estimate I in the form. Classical microchemical approaches used for the estimation of I include mineral-distillation methods (Stolc and Nemeth, 1961) and alkaline-ashing methods (Stabel-Taucher, 1975). Although numerous modifications have been made to both methods over the years, the precision and accuracy of these procedures were often hindered by interference of fats and proteins. Other methods used to determine I in biological matrices are inductively coupled plasma mass spectrometry (Browner, 1987; Harris, 1987) and neutron activation
analysis (James, 2001).
A rapid and inexpensive method for determination of I in milk is the ion-specific electrode (ISE) method. An electrode specific for the detection of the I−ion is coupled to a reference electrode, both of which are connected to a pH meter that is set to the potentiometric mode. Differences in the measured potential between the 2 electrodes are proportional to the concentration of the ion in a sample. The system is first calibrated against a series of aqueous I−standards that encompass the expected range of concentration. A Ni(NO3)2 matrix modifier is added to the milk samples to flood the ionic background of the sample, creating a stable environment against which the change in concentration can be measured (Richardson, 1985).
Although acceptable correlations between ISE methods and chemical reference methods have been reported, problems such as low recovery percentage, long response time at low concentrations, and instrument drift have been cited (Wheeler et al., 1980). The potential can be measured directly from the modified sample matrix, although it is generally believed that better accuracy and precision can be obtained by using a method of known addition. Known addition procedures record the potential both before and after the addition of a known quantity of standard to the matrix; the difference between the 2 measurements is then used to calculate the final concentration of the analyte.
不要软件翻译的,谢谢!
不好意思,我是新手,就这么点分,全奉上了. 展开
Concerns over the levels of I found in milk have emerged globally during the past 25 yr. Studies conducted in several countries suggest that there may be a public health concern caused by the presence of excessive amounts of this trace element in both raw and processed milk supplies. Some jurisdictions have, as a direct result of these concerns, established legislation that regulates the maximum allowable limit for I in milk. Iodine is required for synthesis of various thyroid hormones that are critical for growth, reproduction, thermoregulation, calorigenesis, intermediary metabolism, protein synthesis, and neuromuscular function (Fisher and Carr, 1974).
Some methods measure total I, and others estimate I in the form. Classical microchemical approaches used for the estimation of I include mineral-distillation methods (Stolc and Nemeth, 1961) and alkaline-ashing methods (Stabel-Taucher, 1975). Although numerous modifications have been made to both methods over the years, the precision and accuracy of these procedures were often hindered by interference of fats and proteins. Other methods used to determine I in biological matrices are inductively coupled plasma mass spectrometry (Browner, 1987; Harris, 1987) and neutron activation
analysis (James, 2001).
A rapid and inexpensive method for determination of I in milk is the ion-specific electrode (ISE) method. An electrode specific for the detection of the I−ion is coupled to a reference electrode, both of which are connected to a pH meter that is set to the potentiometric mode. Differences in the measured potential between the 2 electrodes are proportional to the concentration of the ion in a sample. The system is first calibrated against a series of aqueous I−standards that encompass the expected range of concentration. A Ni(NO3)2 matrix modifier is added to the milk samples to flood the ionic background of the sample, creating a stable environment against which the change in concentration can be measured (Richardson, 1985).
Although acceptable correlations between ISE methods and chemical reference methods have been reported, problems such as low recovery percentage, long response time at low concentrations, and instrument drift have been cited (Wheeler et al., 1980). The potential can be measured directly from the modified sample matrix, although it is generally believed that better accuracy and precision can be obtained by using a method of known addition. Known addition procedures record the potential both before and after the addition of a known quantity of standard to the matrix; the difference between the 2 measurements is then used to calculate the final concentration of the analyte.
不要软件翻译的,谢谢!
不好意思,我是新手,就这么点分,全奉上了. 展开
2个回答
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介绍
在牛奶被发现的我水平上的关心已经在过去的 25 yr 期间全球地出现。在一些国家被引导的研究可能有公众的健康关心以由两者的生肉过量的这一种痕迹元素的出现所引起并且处理牛奶补给。一些司法权有,由于这些的直接结果关心,建立了在牛奶为我管理最大的可允许的界限立法。 碘为对生长,再现,温度调节, calorigenesis, 仲裁者新陈代谢 , 蛋白质综合 , 和神经兴肌的功能是紧要关头的各种不同的甲状腺的荷尔蒙的综合被需要。 (渔夫和 Carr,1974)
一些方法尺寸总计我,而且其它以那形式估计我。古典的 microchemical 接近使用过的为我判断包括矿物- 蒸馏方法 (Stolc 和 Nemeth,1961) 和碱性- 灰方法.(Stabel-Taucher,1975) 虽然很多的修正时常已经被制造方法在数年以来 , 精密和这些程序的准确性都被脂肪和蛋白质的冲突阻碍了。 其他的方法过去一直在生物学的矩阵中决定我被归纳地加倍血浆块 spectrometry(比较褐色的,1987;哈利斯,1987) 和中子使活动
分析.(詹姆士,2001)
一个迅速的和廉宜的方法为我的决心在牛奶是离子- 特性电极 (ISE) 方法。 为发现的一种电极特性那我??离子被加倍到一个叁考电极, 两者被连接到 pH 公尺是放置到 potentiometric 模态。 在 2个电极之间的量过潜在性的不同与集中成比例那 ?一个样品的离子。 系统被首先校正刻度反对一系列的水我??包含预期范围的集中标准。 2个点阵式修饰语被增加到牛奶样品泛滥样品的离子背景的 Ni(NO3), 创造稳定的环境反对在 ?方面的改变集中可能被测量。 (Richardson,1985)
虽然 ISE 方法和化学的叁考方法之间的可接受的相互关系已经被,但是问题 , 像是低的恢复百分比,渴望在低的集中回应时间,而且工具漂流物已经被引证 (车夫 et al。,1980). 潜在性可能被从被修正的样品点阵式直接地测量, 虽然一般通常相信较好的准确性和精密可能被藉由使用已知的附加一个方法获得。 已知的附加程序两者都记录潜在性在和之前在已知的量附加之后 ?对点阵式的标准;在 2个测量之间的不同然后用来计算 analyte 的最后集中。
在牛奶被发现的我水平上的关心已经在过去的 25 yr 期间全球地出现。在一些国家被引导的研究可能有公众的健康关心以由两者的生肉过量的这一种痕迹元素的出现所引起并且处理牛奶补给。一些司法权有,由于这些的直接结果关心,建立了在牛奶为我管理最大的可允许的界限立法。 碘为对生长,再现,温度调节, calorigenesis, 仲裁者新陈代谢 , 蛋白质综合 , 和神经兴肌的功能是紧要关头的各种不同的甲状腺的荷尔蒙的综合被需要。 (渔夫和 Carr,1974)
一些方法尺寸总计我,而且其它以那形式估计我。古典的 microchemical 接近使用过的为我判断包括矿物- 蒸馏方法 (Stolc 和 Nemeth,1961) 和碱性- 灰方法.(Stabel-Taucher,1975) 虽然很多的修正时常已经被制造方法在数年以来 , 精密和这些程序的准确性都被脂肪和蛋白质的冲突阻碍了。 其他的方法过去一直在生物学的矩阵中决定我被归纳地加倍血浆块 spectrometry(比较褐色的,1987;哈利斯,1987) 和中子使活动
分析.(詹姆士,2001)
一个迅速的和廉宜的方法为我的决心在牛奶是离子- 特性电极 (ISE) 方法。 为发现的一种电极特性那我??离子被加倍到一个叁考电极, 两者被连接到 pH 公尺是放置到 potentiometric 模态。 在 2个电极之间的量过潜在性的不同与集中成比例那 ?一个样品的离子。 系统被首先校正刻度反对一系列的水我??包含预期范围的集中标准。 2个点阵式修饰语被增加到牛奶样品泛滥样品的离子背景的 Ni(NO3), 创造稳定的环境反对在 ?方面的改变集中可能被测量。 (Richardson,1985)
虽然 ISE 方法和化学的叁考方法之间的可接受的相互关系已经被,但是问题 , 像是低的恢复百分比,渴望在低的集中回应时间,而且工具漂流物已经被引证 (车夫 et al。,1980). 潜在性可能被从被修正的样品点阵式直接地测量, 虽然一般通常相信较好的准确性和精密可能被藉由使用已知的附加一个方法获得。 已知的附加程序两者都记录潜在性在和之前在已知的量附加之后 ?对点阵式的标准;在 2个测量之间的不同然后用来计算 analyte 的最后集中。
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