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A novel colorimetric method for field arsenic speciation analysis

Journal of Environmental Sciences 2012年第7期24卷 1341-1346页

作者： Shan Hu Jinsuo Lu Chuanyong Jing State Key Laboratory of Environmental Chemistry and Ecotoxicology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China School of Environmental and Municipal Engineering Xi'an University of Architecture and TechnologyXi'an 710055China

Accurate on-site determination of arsenic （As） concentration as well as its speciation presents a great environmental challenge especially to developing countries. To meet the need of routine field monitoring, we developed a rapid colorimetric method with a wide dynamic detection range and high precision. The novel application of KMnO4 and CHaN2S as effective As（III） oxidant and As（V） reductant, respectively, in the formation of molybdenum blue complexes enabled the differentiation of As（III） and As（V）. The detection limit of the method was 8 ~tg/L with a linear range （R2 = 0.998） of four orders of magnitude in total As concentrations. The As speciation in groundwater samples determined with the colorimetric method in the field were consistent with the results using the high performance liquid chromatography atomic fluorescence spectrometry, as evidenced by a linear correlation in paired analysis with a slope of 0.9990- 0.9997 （p 〈 0.0001, n = 28）. The recovery of 96%-116% for total As, 85%-122% for As（III）, and 88%-127% for As（V） were achieved for groundwater samples with a total As concentration range 100-800 μg/L. The colorimetric result showed that 3.61 g/L As（III） existed as the only As species in a real industrial wastewater, which was in good agreement with the HPLC-AFS result of 3.56 g/L As（Ⅲ）. No interference with the color development was observed in the presence of sulfate, phosphate, silicate, humic acid, and heavy metals from complex water matrix. This accurate, sensitive, and easy-to-use method is especially suitable for field As determination.

关键词： arsenic speciation colorimetric method groundwater field analysis

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Modification of colorimetric method based digital soil test kit for determination of macronutrients in oil palm plantation

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International Journal of Agricultural and Biological Engineering 2020年第4期13卷 188-197页

作者： Muhammad Yamin Wan Ishak bin Wan Ismail Muhamad Saufi bin Mohd Kassim Samsuzana Binti Abd Aziz Farah Naz Akbar Redmond R.Shamshiri Muhammad Ibrahim Benjamin Mahns Department of Farm Machinery&Power Faculty of Agricultural Engineering&TechnologyUniversity of AgricultureFaisalabad(38040)Pakistan Department of Biological and Agricultural Engineering Faculty of EngineeringUniversiti Putra Malaysia43400 UPM SerdangSelangorMalaysia Department of Allied Health Sciences Sargodha Medical CollegeUniversity of Sargodha(40100)Pakistan Leibniz Institute for Agricultural Engineering and Bioeconomy Max-Eyth-Allee 10014469 Potsdam-BornimGermany Department of Environmental Sciences&Engineering Government College University Faisalabad(38000)Pakistan

It is the need of time that oil palm farmers must perform the spatially planned soil analysis to know about the fertilizer sufficient and deficient zones of *** method is a suitable and fast solution of soil analysis for NPK determination using the digital soil test *** determination procedure with a digital soil test kit was undefined for oil ***,the digital soil test kit determines the passage of light through an opaque medium of soil solution with a specified ***,environmental light may interfere leading to wrong results of NPK ***,this equipment was non-incorporable with the controller of any VRT fertilizer *** this research,these issues were addressed and the NPK measurement procedure was defined for oil palm plantation by modifying the‘soil to water’ratio in sample soil solution with an optimum environmental light range of 18-23 W/m^(2).‘Soil to water’ratios were found for nitrogen,phosphorus and potassium as 0.31 to 5.00,1.00 to 5.00 and 4.50 to 5.00,respectively to fit the requirement of NPK for oil palm in the prescribed range of the *** study of modified digital soil test kit showed that 91.7%N,89.6%P and 93.8%K results of modified digital soil test kit were matched with analytical laboratory ***,the reliability of NPK results using digital soil test kit was enhanced,making the kit incorporable with the controller of variable rate fertilizer applicator through remote monitoring based data acquisition *** outcome of this research can be used in the development of an IoT network data fusion for dynamic assessment of the NPK variation in the soil and nutrient management in oil palm plantations.

关键词： digital soil test kit variable rate fertilizer applicator oil palm NPK measurement data acquisition system colorimetric method

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Application of silver nitrate colorimetric method to non-steady-state diffusion test

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Journal of Central South University 2012年第10期19卷 2983-2990页

作者：元强邓德华史才军 G.de Schutter School of Civil Engineering and Architecture Central South University College of Civil Engineering Hunan University Magnel Laboratory for Concrete Research Department of Structural EngineeringTechnologiepark-Zwijnaarde 904Ghent UniversityGhent(Zwijnaarde)B-9052Belgium

NT build 443, or profile fitting method, is often used to measure the diffusion coefficient of chloride in concrete. However, this method is quite laborious and needs special equipment. colorimetric method is a quick and simple method to measure the penetration depth of chloride by spraying 0.1 mol/L silver nitrate solution. The objective of this work is to study the possibility of the use of colorimetric method in the calculation of non-steady-state diffusion coefficient. Twelve concrete mixtures with different supplementary cementitious materials and water-to-cement ratios of 0.35, 0.48 and 0.6 were used for study. According to NT build 443, the concrete specimens were immersed in 165 g/L NaC1 （2.8 mol/L） solution for 42 d. Both water-soluble （convert to free chloride） chloride and acid-soluble chloride at different layers of specimens were measured. The results show that the mean value of free chloride concentration at the color change boundary Cd was 0.306 mol/L. The surface free chloride concentration cs was obtained by profile fitting method, which was 40% lower than the chloride concentration of exposure solution after an immersion period of 42 d. Chloride diffusion coefficients obtained by the colorimetric method was not well correlated with those obtained by profile fitting method.

关键词： colorimetric method silver nitrate colorimetric method chloride diffusion non-steady-state diffusion concrete chloride-induced corrosion

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Multiphysics coupling in situ measurement method for laser repair of the Inconel 718 alloy structure

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Science China(Technological Sciences) 2023年第10期66卷 2986-2995页

作者： SHI WenXiong ZHANG ChengHao CHEN Ru XIE HuiMin LIU Fei School of Aerospace Engineering Tsinghua UniversityBeijing 100084China

As an additive manufacturing technique,the laser-aided direct energy deposition(L-DED)method has been widely used for component repair(also called laser repair).With significant differences from traditional manufacturing techniques,the laser repair process has the characteristics of point-by-point deposition and has a high-temperature gradient in the repair area,resulting in the formation of heterogeneous thermal deformation and residual stress after *** stress may lead to the appearance of cracks in the repair area and may seriously influence the bearing capacity of the repaired ***,the characterization of the temperature and deformation fields of the components during laser repair is important for the analysis of the mechanism of damage evolution in the repair area,optimization of the process parameters,and improvement of the mechanical properties of the repaired *** of the demand for the simultaneous measurement of the temperature and deformation fields,using a multispectral camera and a self-designed three-peak filter,a temperature-deformation field measurement technique was developed and applied to in situ monitoring during the L-DED manufacturing *** the actual measurement process,the synchronous measurement of the temperature field of the laser molten pool and the deformation field of the side surface of the repaired component were realized using the images of multiple channels in the multispectral *** experimental results verify that a three-peak filter can effectively eliminate the influences of glare and overexposure on the recorded multispectral ***,the amplitude of the displacement field and the temperature gradient of the repaired component will increase with the increase in laser power,which may affect the final molding of the repaired *** work extends the function of the multispectral camera to measure the temperature and deformation fields and provides a new measurement method f

关键词： laser-aided direct energy deposition temperature field deformation field colorimetric method orthogonal sampling Moirémethod

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Gas-liquid-liquid slug flow and mass transfer in hydrophilic and hydrophobic microreactors

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Chinese Journal of Chemical Engineering 2022年第10期50卷 85-94页

作者： Yanyan Liu Chaoqun Yao Guangwen Chen Dalian National Laboratory for Clean Energy Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023China University of Chinese Academy of Sciences Beijing 100049China

Gas-liquid-liquid three-phase slug flow was generated in both hydrophilic and hydrophobic microreactors with double *** bubble-droplet relative movement and the local mass transfer within the continuous slug and the dispersed droplet were *** was found that bubbles moved faster than droplets under low capillary number(Ca),while droplets moved faster upon the increase of Ca due to the increased *** the first time,we observed that the increased viscosity of droplets fastened the droplet *** mass transfer in the continuous slug was dominated by convection,leading to nearly constant global mass transfer coefficient(k_(L)a);while that in the dispersed droplet was dominated by diffusion,resulting in k_(L) decreasing along the *** features are analogical to the corresponding gas-liquid or liquid-liquid two-phase slug flow,but the formation of bubble-droplet clusters caused by relative movement lowered the absolute mass transfer *** results provide insights for the precise manipulation of gas-liquid-liquid slug flow in microreactors towards process optimization.

关键词： Mass transfer Multiphase flow Slug flow Microreactor colorimetric method

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Research on synchronous measurement technique of temperature and deformation fields using multispectral camera with bilateral telecentric lens

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Theoretical & Applied Mechanics Letters 2022年第3期12卷 137-144页

作者： Wenxiong Shi Yangyang Li Ru Chen Chenghao Zhang Zhanwei Liu Huimin Xie Fei Liu School of Aerospace Engineering Tsinghua UniversityBeijing 100084China School of Aerospace Engineering Beijing Institute of TechnologyBeijing 100081China

The hot-section parts easily occur the creep-fatigued interaction under the condition of mechanicalthermal coupled load during the period of service, which may lead to the damage of the parts, and therefore, the measurement and characterization of thermal-deformed fields of the parts are important to understand its damage process. Aiming at relevant demand, the bilateral telecentric-multispectral imaging system was established, the research of synchronous measurement technique of the temperature and deformation fields was developed. On the one hand, the measurement technology for surface temperature of the object was developed using the two-color images captured by the multispectral camera with bilateral telecentric lens and combined with colorimetric method. On the other hand, the 2 D-DIC measurement technique of the multispectral camera was developed by conducting digital image correlation analysis using the blue light images before and after deformation, which can measure the high temperature deformation field of the object(the blue light images were filtered by multispectral camera).Results showed that the bilateral telecentric lens is used to replace the ordinary optical lens for imaging,which can effectively eliminate the distortion of the multispectral imaging system. Since the temperature measurement process of this measurement system is little affected by the emissivity of the object, therefore, it has excellent robustness. The thermal expansion coefficients of the nickel alloys are evaluated at the temperature ranges of 700–1000℃, indicating this system can achieve the synchronous and precise measurement of the temperature and deformation fields of the object.

关键词： Bilateral telecentric-multispectral measuring system colorimetric method Digital image correlation Synchronous measurement Temperature and deformation fields

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Changes of dynamical balance of free radicals induced by levodopa in rat glia-containing mesencephalic culture fluid

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Neural Regeneration Research 2006年第5期1卷 401-404页

作者： Wenxia Li Shenggang Sun Jingru Wang Baoliang Sun Yanbo Zhang Deparlment of Neurology Affiliated Hospital of Taishan Medical University Taian 271000Shandong Province China Department of Neurology Union Hospital Tongji Medical College Huazhong University of Science and TechnologyWuhan 430022 Hubei Province. China

BACKGROUND ： Parkinson disease is neurodegenerative disorders, characterized by a progressive and selective degeneration of nigrostdatal dopaminergic pathway. Its main clinical symptoms include bradykinesia, dgidity, rest tremor and disturbances in balance. Levodopa （L-DOPA） is the ＂gold standard＂ for the symptomatic treatment of Parkinson disease, but L-DOPA is toxic to dopaminergic neurons and the chronic administration of L-DOPA often causes the side effects of motor such as ＂on-off ＂, etc., and its mechanism still has not been completely clarified. OBJECTIVE ： To observe the changes of the content of glutathione （GSH）, activities of glutathione peroxidase （GSH-Px） and superoxide dismutase （SOD） and content of malondialdehyde （MDA） in gila-containing mesencephalic culture fluid after L-DOPA of different concentrations were added. DESIGN： A comparative observation. SETTINGS ： Department of Neurology, Affiliated Hospital of Taishan Medical University; Department of Neurology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology. MATERIALS ： The experiment was carried out in the Basic Research Institute, Taishan Medical University from December 2003 to September 2004. Ten postnatal newborn SD rats （within 2 days） were selected, either male or female. Fetal bovine serum （DMEM/F12） was from Gibco Company; L-DOPA and glial fibrillary acidic protein （GFAP） from Sigma Company. Kits for determination of GSH, GSH-Px, SOD and MDA were purchased from Nanjing Jiancheng Bioengineering Research Institute. methodS ： Gila-containing mesencephalic culture fluid were placed in 24-well culture plate, and L-DOPA of 50, 100 and 500 μmot/L was added to each group, the blank control group was also set. The glia-containing mesencephalic culture fluid selected at 4, 24, 48 and 72 hours respectively to determine the GSH content with colorimetdc quantitative technique, GSH-Px activity with colorimetdc method, SOD activity with xanthine oxidase meth

关键词： free radicals Parkinson disease neurodegenerative disorders Science and Technology glutathione peroxidase superoxide dismutase dopaminergic neurons colorimetric method dynamical balance xanthine oxidase determination of Basic Research acidic protein side effects time point

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Enzymatic method for Rapid Determination of Oxalic Acid in Bleaching Filtrates from the Pulp and Paper Industry

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Journal of Donghua University(English Edition) 2005年第5期22卷 64-68页

作者：洪枫 SJ(O|¨)DE Anders NILVEBRANT Nils-Olof J(O|¨)NSSON Leif J Institute of Biological Sciences and Biotechnology Donghua University Shanghai 200051 Division for ChemistryKarlstad UniversitySE-65188 KarlstadSweden Division for Chemistry Karlstad University SE-65188 KarlstadSweden STFI-Pack forsk ABSwedish Pulp and Paper Research InstituteSE-11486 StockholmSweden STFI-Pack forsk AB Swedish Pulp and Paper Research Institute SE-11486 StockholmSweden Division for Chemistry Karlstad University SE-65188 KarlstadSweden

Bleaching with oxygen-containing agents and recirculation of process streams in the pulp and paper industry has increased the accumulation of oxalic acid and danger for precipitation of calcium oxalate encrusts, scaling. Analysis and control of oxalic acid in bleaching filtrates is therefore becoming increasingly important in the pulp and paper industry. Chromatographic methods, such as IC and HPLC, are generally more time-consuming but are valuable as standard methods for determination of oxalic acid. However, the instrumentation needed is expensive and stationary. In this study, an enzymatic method based on oxalate oxidase and peroxidase was developed to determine oxalic acid in authentic bleaching filtrates using a spectrophotometer. The results showed that bleaching filtrates contain some compounds interfering with the enzymatic method. Pretreatment of the samples with activated charcoal was a successful approach for decreasing problems with interference. By using dilution followed by charcoal treatment, the results obtained from five bleaching filtrates with the colorimetric method correlated very well with those obtained using IC. This study offers a selective, fast and mobile analysis method to determine oxalic acid in bleaching fiRrates from the pulp and paper industry, The convenient enzyme-based method improves the possibilities for control of critical oxalic acid concentrations in closed-loop bleaching streams.

关键词： oxalic acid oxalate oxidase colorimetric method bleaching filtrates activated charcoal the pulp and paper industry

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Survey of Dual Waveband colorimetric Temperature Measurement Technology

Survey of Dual Waveband Colorimetric Temperature Measurement...

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第26届中国控制与决策会议

作者： Ren Yan Zhou Xiaomin Fu Li School of Automation Shenyang Aerospace University

ISBN: (纸本)9781479937066

Radiation thermometry is one of the important ways to obtain target temperature, which mainly includes dual-waveband colorimetric temperature measurement. The precision is limited by atmospheric transmittance and the air path radiation when infrared signature of a target measured in the atmosphere. To increase the precision, a correction-based dual-waveband color comparison thermometric method is presented, which puts a reference blackbody next to the target for comparison. Due to colorimetric temperature measurement curve is non-linear, a new method that uses piecewise linear method to fit it, which uses the zero point of first derivative of absolute error that determine the maximum error. It has fewer segments and high fitting precision. Non-contact temperature measurement which uses the two-color thermometry based on CCD image sensor is recently presented. The main error sources come from the change in emissivity of a measured object with the wavelength and the non-ideal CCD spectrum response characteristic. Thus, an improved method is proposed, which is independent of the spectroscopic characteristics and the representative wavelengths of the CCD.

关键词： colorimetric method Blackbody Real-time correction Non-linear Correction CCD image sensor

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Peptide and AuNPs based Platform for Constructing Logic Gates

Peptide and AuNPs based Platform for Constructing Logic Gate...

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第八届全国化学生物学学术会议

作者： Yong Li Wang Li Zhuoliang Liu Zhou Nie Shouzhuo Yao State Key Laboratory of Chemo/Biosensing and Chemometrics College of Chemistry and Chemical EngineeringHunan University

＜正＞Molecular logic gate is the base of molecular *** far,molecular logic gates have made great progress,especially in DNA logic ***,peptide-based logic gates are rarely *** this paper,peptides were utilized as logi... 详细信息

关键词： Molecular logic gate Specific peptide Gold nanoparticles colorimetric method

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