光度测定

Methods A series of improved experiments on barium chromate spectrophotometry without heating and the experiments of precision and accuracy,as well as comparison of experimental data between the improved method and the National Standard Method were carried out.

方法采用不加热方法，对铬酸钡分光光度法进行一系列改进实验，并进行了精密度及准确度试验，与国家标准方法的测定结果进行了比较实验。

In this study,the organic sulfur compound is decomposed in a oxygen flask;organic sulfur is turned into sulfate sulfur,and then the measure of sulfate is determined by Barium Chromate Spectrophotometer .

本文用氧弹燃烧法将煤中有机硫氧化成二氧化硫和三氧化硫，再将其转化成硫酸盐硫，建立铬酸钡光度法测定硫酸根的方法，从而间接得到有机硫的含量。

With a high accuracy, the biuret in compound fertilizer is determined from the color reaction between biuret and copper by copper double salt spectrophotometry, meanwhile the remove of PO43-,Ca2+, Mg2+and NH3 interferences is described without other and new interfering matters.

利用缩二脲铜的色泽反应，采用铜复盐分光光度法测定复合肥中的缩二脲，并介绍除去PO43-，Ca2+，Mg2+，NH3干扰的方法，并且在此过程中不能引入新的干扰物质。该方法精密度较好。

AITC content of pungent products was determined by ultraviolet spectrophotometry, and compared with sensory evaluation. Results suggested that AITC content of pungent products was positively corelated to score of sensory evaluation of pungent degree.

然后选用紫外分光光度法对辛辣风味制品的AITC含量进行测定，同时探讨其与感官评价粗略定量之间的关系，结果表明辛辣程度感官评分与AITC含量呈正相关关系。

Methods:Using 10% OP and 10% TWEEN-20 as increasing dissoluble agents, andPAN as developing dye,the absorption of the complex compound of cadmium was measured at 555 nm. The content of the tracecadmium in water sample was determined.

分别以体积分数为10％OP和体积分数为10％吐温-20为增溶剂，以PAN1-(2-吡啶偶氮-2-萘酚为显色剂，在555nm波长处测定水中镉络合物的吸光度。

Methods Atomic absorption spectrometry was applied to determine the lead content in the air and dust in the main trunk roads around the primary schools in that region.

采用原子吸收分光光度法，对该区小学内及周围交通干道空气和尘土中的铅含量进行测定。

The new technique reduced the distance ladder to three "rungs":(1) The distance to galaxy NGC4258 is measured using straightforward geometry and Kepler's laws;(2)Cepheids in six more distant galaxies are used to calibrate the luminosity of Type Ia supernovae;(3) The Hubble constant is measured by observing a brighter milepost marker, Type Ia supernovae, in more distant galaxies hundreds of millions of light-years away, embedded in the expanding universe.

这种新技巧简化了距离跳跃为三个&阶梯&：1、星系NGC 4258的距离采用开普勒定律和简单直接的几何方法精确测量；2、在6个更远的星系中的造父变星用来校准Ia超新星的光度；3、深嵌于数亿光年外的膨胀宇宙中的星系中的Ia超新星——一种遥远而明亮的量天尺，被用于精确测定哈勃常数。

Because NGC 4603 is much farther away than the other galaxies studied with Hubble by the Key Project team, 108 million light-years, its stars appear very faint from the Earth, and so accurately measuring their brightness, as is required for distinguishing the characteristic variations of Cepheids, is extremely difficult.

由于它远在1.08亿光年外，远超项目组团队研究的其他星系，故此恒星变得非常黯淡，而任务要求必须正确测定其中的特定变星——造父变星——的光度，显得格外困难。

Gelatin and egg white were used as clarifiers to eliminate the sediment of soy sauce.

利用明胶、蛋清液2种澄清剂对酱油进行澄清试验，并对处理后的酱油吸光度值、氨基酸态氮等进行了测定。

Four clarifiers including bentonite, casein, egg white liquid and JA were applied respectively in the clarification of Gaocheng fermented wine and their effects were evaluated through the measurement of the absorbency value and light transmittance of the wine and the observation of wine precipitate and wine color change.

利用皂土、干酪素、蛋清液、JA 4种澄清剂对高橙发酵原酒进行澄清处理，测定高橙原酒的吸光度值、透光率，观察沉淀物和酒色的变化情况。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。