查询词典 absorbance

The invention discloses a method for measuring seawater chemical oxygen demand by photometry, wherein the seawater exemplar is first pre-processed, then using the basic potassium hypermanganate as reaction system, the potassium permanganate is deacidized quantitatively by organics to produce manganate, using pure water or margin solution as reference ratio, measuring the absorbance an of the manganate at its maximum absorbing wave length 430 nm, drafting the A-COD value operating curve, obtaining the concentration of the organics in the water, i.e.

本发明公开了一种对海水化学需氧量进行测定的光度测定法，该方法首先将海水样品进行预处理，再以碱性高锰酸钾为反应体系，这样海水中的有机物在强碱性介质中与过量的高锰酸钾迅速反应，高锰酸钾被有机物定量还原后生成锰酸盐，以纯水或空白溶液作参比，在锰酸盐的最大吸收波长430nm处测其吸光度A，该吸光度A与海水样品中的有机物的含量具有正相关关系。

The absorbance and transmittance spectra of fresh leaves were increased with the decreasing mesophyll water content.

新鲜甘薯叶片中的水分含量减少，使吸收光谱增加，但经脱色处理后，吸收光谱因水分含量增加而上升。

In this method, EDTA was used as complexant which can form 1∶1 complex with Cr〓, this complex carried negative charge and can be detected directly by UV absorbance at 200nm, therefore, the CrO〓 and Cr〓 can be separated and determined in one run.

采用乙酸钠-乙二胺四乙酸钠-CTAB-乙酸缓冲液体系，加入EDTA使Cr〓与其生成的1∶1络合物，带负电荷且具有紫外吸收，在200nm处可用直接紫外法检测。

Results: Absorbance shows good linear relationship to the cell number in the range of 0.25×10^5-2×10^5 cell mL^(-1). The concentration limit for the testing samples without cytotoxicity was 7.812mgmL^(-1). The testing samples significantly inhibited the oversecretion of TNF-α and IL-8 in HL-60 cells stimulated by LPS.

结果：细胞密度在0.25~2×10^5 cellmL^(-1)范围时，吸光度与细胞数呈良好的线性关系；供试液无毒界限为7.8l2mgmL^(-1)；三种给药方式均能显著抑制LPS诱导HL-60细胞释放TNF-α和IL-8，其中供试液与LPS共育时抑制作用最强。

The prepared powders were characterized by XRD, UV-Vis, FTIR, N_2 adsorption, Fluorescence spectroscopy, etc. N-doped TiO_2 evidently shows its absorbance shoulder shift into visible light region. Moreover, N-doping retards the transition of TiO_2 from anatase to rutile type as well as restrains the growth of the crystal size which leads to less decrease of surface area. These characteristics are considered to benefit the photoactivity of TiO_2; When all the samples were applied to the photodecomposition of Methylene Blue under visible light(λ＞400 nm), the N-doped TiO_2 show an obvious superiority when compared to the undoped TiO_2, the active hydroxyl groups are found to play a important role in this high photoactivity; When the same experiment was performed under UV light, all the samples show the consistent sequence of photoactivity as in the visible light.

通过UV-Vis、XRD、BET、IR、FL等表征手段测试表明：掺氮不仅使TiO_2的光吸收区域拓展到可见光区，而且有利于延缓TiO_2晶相的转换，从而抑止了高温煅烧下所引起的晶粒增大以及比表面积的降低，且氮源浓度越高，此现象越明显，这些特征都有利于催化剂光催化活性的提高；在主波长大于400nm的可见光催化亚甲基蓝实验当中，掺氮TiO_2的光催化活性明显优越于未掺氮样品，亚甲基蓝在90min内达到88％的脱色率。

Plot the absorbance versus the amount of glucose on the plotting paper below.

将吸光值与对应的葡萄糖水浓度画在下方的记录纸中。

Results: The absorbance of plumbum presented a linear relationship in the range of 2.0-20.0 ng/ml (r=0.998 4), with the average recovery of 97.48%, RSD was 2.51%.

结果：铅元素在2.0～20.0 ng/ml范围内其吸光度与浓度呈良好的线性关系（r=0.998 4），平均回收率为97.48%，RSD=2.51％。

MTS and PMS mixture was added in 96 h and absorbance values were measured at 490 nm.

结果 对4000多种化合物的抗SARS病毒作用进行了检测。

Shenyang Research Institute of Chemical Industry, Shenyang 110021, China Abstract: Spectrophotometric analysis showed that the peak absorbance for food dye of Allura Red and biological dye of Ponceau-G occurred at 501 and 510 nm. In sunlight after 2, 4, 6, 8, 10 hours, the decomposition rates of Allura Red and Ponceau G were between 2.4 to 5.8% and 3.4 to 10.8%, so they are stable in sunlight. The recovery rates on cottons and glasses were very high, so they are easily recoveried from targets. Further studies showed that the recovery rates of two dyes on the leaves of wheat, cabbage, cucumber and tomato were different, so it need previously determine the recovery rate of tracer on the target crop to adjust the result. Field experiment showed it was easy to measure the pesticide spray distribution of high volume spay and low volume spray to use Allura Red and Ponceau-G as tracers.

沈阳化工研究院，沈阳 110021 摘要：光谱分析表明，食品染色剂诱惑红和生物染色剂丽春红-G的最大吸收波长分别为501 nm和510 nm ；在连续2、4、6、8、10 h阳光照射下，分解率分别在2.4%~5.8%和3.4%~10.8%之间，见光稳定性良好；两种染色剂在棉花叶片和玻璃片上的洗脱回收率都很高，说明易于从靶标上洗脱下来；进一步测定表明，两种染色剂在小麦、甘蓝、黄瓜、番茄叶片上的洗脱回收率各不相同，所以对准备进行测试的作物应先做一次洗脱回收率试验，用以校正测试结果；田间应用表明，用两种染色剂做示踪剂，可以方便地测定常量喷雾和低容量喷雾过程中农药在麦田的沉积分布情况。

At the same time it had been found that the surface plasmon resonance absorbance of the DDP-modified gold nanoparticles had a large red shift.

用红外光谱分析了DDP与金颗粒表面的结合方式，并通过对等离子体振动特点的分析，用谐振子模型解释了红移发生的原因。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。