检索结果-南通市图书馆

Simplified quantitative analysis method and its application in the insitu synthesized copper-based azide chips

Defence Technology（防务技术） 2024年第2期32卷 309-316页

作者： Jie Ren Yunfeng Li Mingyu Li Xingyu Wu Jiabao Wang Qingxuan Zeng State Key Laboratory of Explosion and Technology Beijing Institute of TechnologyBeijing 100081China

Copper-based azide(Cu(N_(3))2 or CuN_(3),CA)chips synthesized by in-situ azide reaction and utilized in miniaturized explosive systems has become a hot research topic in recent years.However,the advantages of in-situ synthesis method,including small size and low dosage,bring about difficulties in quantitative analysis and differences in ignition capabilities of CA chips.The aim of present work is to develop a simplified quantitative analysis method for accurate and safe analysis of components in CA chips to evaluate and investigate the corresponding ignition ability.In this work,Cu(N_(3))2 and CuN_(3)components in CA chips were separated through dissolution and distillation by utilizing the difference in solubility and corresponding content was obtained by measuring N_(3)-concentration through spectrophotometry.The spectrophotometry method was optimized by studying influencing factors and the recovery rate of different separation methods was studied,ensuring the accuracy and reproducibility of test results.The optimized method is linear in range from 1.0-25.0 mg/L,with a correlation coefficient R^(2)=0.9998,which meets the requirements of CA chips with a milligram-level content test.Compared with the existing ICP method,component analysis results of CA chips obtained by spectrophotometry are closer to real component content in samples and have satisfactory accuracy.Moreover,as its application in miniaturized explosive systems,the ignition ability of CA chips with different component contents for direct ink writing CL-20 and the corresponding mechanism was studied.This study provided a basis and idea for the design and performance evaluation of CA chips in miniaturized explosive systems.

关键词： Copper-based azide chips spectrophotometry Separation method Quantitative analysis Ignition ability

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Rapid accuracy determining DNA purity and concentration in heavy oils by spectrophotometry methods

引用

Petroleum Science 2023年第6期20卷 3394-3399页

作者： YunYang Wan HongMei Mu Na Luo JianPing Yang Yan Tian Ning Hong HaiLiang Dong National Key Laboratory of Petroleum Resources and Engineering Research Centre for Geomicrobial Resources and ApplicationBeijing Key Laboratory of Petroleum Pollution and ControlUnconventional Petroleum Research InstituteChina University of PetroleumBeijing102249China Drilling and Production Engineering Technology Department of PetroChina Liaohe Oilfield Company Panjin124010LiaoningChina Center for Geomicrobiology and Biogeochemistry Research State Key Laboratory of Biology and Environmental GeologyChina University of GeosciencesBeijing100083China

DNA analysis is the core of biotechnology applied in petroleum resources and engineering. Traditionally accurate determination of DNA purity and concentration by spectrometer is the first and critical step for downstream molecular biology research. In this study, three different spectrophotometry methods, BPM, NDTT and NPMTTZ were compared for their performance in determining DNA concentration and purity in 32 oil samples, and molecule methods like quantitative real-time PCR (qPCR) and high-throughput sequence were also performed to help assess the accuracy of the three methods in determining DNA concentration and purity. For ordinary heavy oil (OHO), extra heavy oil (EHO) and super heavy oil (SHO), the characteristics of high viscosity (η), density (ρ) and resin plus asphaltene content will affect the DNA extraction and UV determination. The DNA concentration was decreased as density increased: OHO (11.46 ± 18.34 ng/μL), EHO (6.68 ± 9.67 ng/μL) and SHO (6.20 ± 7.83 ng/μL), and the DNA purity was on the reverse: OHO (1.31 ± 0.27), EHO (1.54 ± 0.20), and SHO (1.83 ± 0.32). The results suggest that spectrophotometry such as BPM and NPMTTZ are qualitatively favorite methods as the quick non-consumable methods in determining DNA concentration and purity of medium oil and heavy oil.

关键词： Heavy oil DNA concentration DNA purity spectrophotometry qPCR

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Determination of arsenic in air particulates and diesel exhaust particulates by spectrophotometry

引用

Journal of Environmental Sciences 2005年第1期17卷 156-158页

作者： S.M.Talebi M.Abedi DepartmentofChemistry IsfahanUniversityIsfahan81745Iran

A method was developed for the determination of trace arsenic by spectrophotometry. The proposed method is rapid, simple, and inexpensive. This method can be used for sensitive determination of trace arsenic in environmental samples and especially in air particulates. The results obtained by this method as a proposed method were compared with those obtained by hydride generation atomic absorption spectrometry as a popular reported method for the determination of arsenic and an excellent agreement was found between them. The method was also used for determination of arsenic associated with airborne particulate matter and diesel exhaust particulates. The results showed that considerable amount of arsenic are associated with diesel engine particulates. The variation in concentration of arsenic was also investigated. The atmospheric concentration of arsenic was different in different sampling stations was dependent to the traffic density.

关键词： arsenic air particulates diesel exhaust particulates spectrophotometry

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Determination of Carbohydrazide and Kinetics of Condensation reaction of Carbohydrazide with Malachite Green by spectrophotometry

引用

Chinese Journal of Chemistry 2005年第1期23卷 50-53页

作者：伍涛张同来陈红艳张建国 StateKeyLaboratoryofPreventionandControlofExplosion BeijingInstituteofTechnologyBeijing100081China

The kinetics of the condensation reaction of malachite green and carbohydrazide was studied by spectrophotometry in aqueous solution in the temperature range of 15.0–22.0 °C. The reaction was found to be second‐order overall, first‐order with respect to each reactant. The effect of ionic strength on the reaction has negative salt effect in the range of 0.2–1.0 mol ˙ L –1 . A mechanism of the reaction between malachite green and carbohydrazide was proposed, and the rate equation derived from the mechanism can explain all experimental observations properly. Based on this reaction, a method of determining the content of carbohydrazide in the concentration range of (0.02–0.5)×10 −3 mol · L −1 was proposed.

关键词： carbohydrazide malachite green kinetics and mechanism spectrophotometry

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Analysis of Peanut Oil Adulterated with Other Edible Oils by spectrophotometry

引用

Chemical Research in Chinese Universities 2012年第1期28卷 14-18页

作者： SU Rui1, WANG Xing-hua1, ZHAO Tian-qi1, YU Wen-zhi1, FENG Xu-dong1, ZHANG Han-qi1 and YU Ai-min1,2 1. College of Chemistry, Jilin University, Changchun 130012, P. R. China 2. Changchun Jilin University Little Swan Instrument Co., Ltd., Changchun 130012, P. R. China College of Chemistry Jilin University Changchun 130012

Since peanut oil（PO） is more expensive than other seed oils, some PO is adulterated with other cheap seed oils, such as soybean oil, palm olein, cottonseed oil, corn oil and rapeseed oil. The conventional method for deter mining whether PO was adulterated is to detect the freezing point of oils. The proposed method for the determination of adulterants in PO was based on monitoring the change of absorbance when the sample was refrigerated. A special spectrophotometer was developed. A total of 10 kinds of POs from different suppliers were chosen and adulterated with other seed oils at the volume fraction levels ranging from 5% to 30%. A total of 150 samples were analyzed by the proposed method and the results were satisfactory.

关键词： Peanut oil Adulteration spectrophotometry Direct analysis

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

A sensitive and rapid UV-vis spectrophotometry for organophosphorus pesticides detection based on Ytterbium(Yb3+) functionalized gold nanoparticle

引用

Chinese Chemical Letters 2018年第12期29卷 1845-1848页

作者： Yuan Li Qingjiao Luo Rong Hu Zongbao Chen Ping Qiu Department of Chemistry Nanchang UniversityNanchang 330031China Jiangxi Medical Device Testing Center Nanchang 330047China School of Chemistry and Environmental Science Shangrao Normal UniversityShangrao 334001China

A kind of sensitive, rapid, and simple spectrophotometry based on a Ytterbium(Yb3+) functionalized gold nanoparticle(Au NPs-Yb) was developed for detection of organophosphorus pesticides(OPs). Prepared AuNPs possess oxygen-containing functional groups and strong complexation reaction with Yb3+. While oxygen-containing thiophosphate in the OPs molecule can combine with Yb3+as a cross-linking molecule to produce insoluble yetterbium phosphate, resulting in the aggregation of AuNPs and great decrease in ultraviolet absorbance strength at 520 nm by ultraviolet visible(UV-vis) spectrophotometer. Under the optimized conditions, a linear relationship between the absorbance of AuNPs and OPs concentration ranged from 0.05 μg/L to 6.0 μg/L with limit of detection for 0.03 μg/L(S/N = 3), which is far lower than the maximum residue limit(0.01 ppm) in the European Union pesticides database. Therefore, this assay has potential application in the determination of OPs in the field of environmental and food monitoring.

关键词： Ytterbium Gold nanoparticles spectrophotometry Organophosphorus pesticides Coordination-bonding interaction

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Simultaneous Determination of Zirconium and Hafnium by Dual System and Dual Wavelength spectrophotometry

引用

Rare Metals 1993年第4期12卷 301-304页

作者：张贵珠刘蜀利杨万龙何锡文史慧明 Nankai University Tianjin 300071China

A dual system and dual wavelength spectrophotometry (DSDWS) used to simultaneously determine Zr and Hf were proposed. Zr(Hf)-XO-CIMAB and Zr(Hf)-CAB-CDMAA-Triton X-100 were chosen as a pair of chromophoric systems. The difference of chromophoric behaviours between Zr and Hf is increased by the addition of hydrogen peroxide as masking agent and by adjustment of acidity. The apparent molar absorptivities of Zr and Hf are 2.0×105 and 5.0×104 L·mol-1·cm-1 respectively. The procedure is simple and rapid.

关键词： Hafnium Measurements spectrophotometry Wave propagation Wavemeters

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Quantitative analysis of cefixime via complexation with palladium(Ⅱ) in pharmaceutical formulations by spectrophotometry

引用

Journal of Pharmaceutical Analysis 2013年第4期3卷 248-256页

作者： Syed Najmul Hejaz Azmi Bashir Iqbal Nada Said Hassan Al-Humaimi Iman Rashid Saif Al-Salmani Noora Ali Saad Al-Ghafri Nafisur Rahman Department of Applied Sciences Chemistry SectionHigher College of Technology Department of Chemistry Aligarh Muslim University

An optimized and validated spectrophotometric method has been developed for the determination of cefixime in pharmaceutical formulations. The method is based on the complexa- tion reaction between cefixime and palladium ion in the presence of acidic buffer solution （pH 3） in ethanol-distilled water medium at room temperature. The complex absorbed maximally at 352 nm. Beer＇s law is obeyed in the working concentration range of 2.5-35 μg/mL with apparent molar absorptivity of 1.015×104 L/mol cm and Sandell＇s sensitivity of 0.001 μg/cm2/0.001 absorbance unit. The limits of detection and quantitation for the proposed method are 0.175 and 0.583μg/mL, respectively. The effect of common excipients used as additives has been studied in the determination of cefixime. The proposed method has been successfully applied for the determina- tion of cefixime in pharmaceutical formulations. The results obtained by the proposed method were statistically compared with the reference method using t and F values and found no significant difference between the two methods.

关键词： spectrophotometry Cefixime Palladium ion Pd（II）-cefixime complex

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Comparison between spectrophotometry and Gas Phase Molecular Absorption Spectrometry for Determination of Nitrite Nitrogen in Flue Gas

引用

Meteorological and Environmental Research 2022年第6期13卷 60-62页

作者： Jun SUN Tianjun DU Hualin GONG Jinan Ecological and Environmental Monitoring Center of Shandong Province Jinan 250101China

spectrophotometry and gas phase molecular absorption spectrometry for determination of nitrite nitrogen in flue gas were compared.KOH absorption solution was used to absorb nitrite nitrogen in flue gas,and the concentration of nitrite nitrogen in the absorption solution was determined by spectrophotometry and gas phase molecular absorption spectrometry to obtain the concentration of nitrite nitrogen in flue gas.The experiments show that both methods are accurate and reliable.

关键词： spectrophotometry Gas phase molecular absorption spectrometry Flue gas Nitrite nitrogen Comparison

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Evaluation of Uncertainty in the Determination of Ozone Concentration in the Air by Sodium Indigo Disulfonate spectrophotometry

引用

Meteorological and Environmental Research 2022年第1期13卷 70-72页

作者： Tingting ZHANG Xiujuan YU Shijing BIAN Suzhou Institute of Tongji University Suzhou 215101China

The uncertainty of the determination of ozone concentration in the air at a workplace by sodium indigo disulfonate spectrophotometry was evaluated.The results show that the expanded uncertainty of ozone concentration U was 0.016 mg/m^(3),and the main factor affecting the measurement uncertainty of ozone concentration was the uncertainty introduced during sample collection.

关键词： Sodium indigo disulfonate spectrophotometry Ozone concentration Measurement uncertainty

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：