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Validation Method on Determination of Chemical Oxygen Demand Using Indirect UV-Vis Spectrometry YULI Rohyami1,a*, TONI Aprianto1,b and MARJONO2 1Diploma Program of Analytical Chemistry, Chemistry Department, Universitas Islam Indonesia, Yogyakarta, Indonesia 2Sanitation and Water Infastructure Management Centre, Yogyakarta, Indonesia arohyami@uii.ac.id, btoniiaprianto@gmail.com Keywords: chemical oxygen demand, validation method, precision, accuracy, uncertainty Abstract.
Ma, Determination of chemical oxygen demand in aqueous sample with non-electrochemical methods, Trend in Environmental Analytical Chemistry, 14 (2017) 37-43 [4] S.
Meng, Development of a three-dimensional structured carbon fiber felt/-PbO2 electrode and its application in chemical oxygen demand determination, Electrochimica Acta. 176 (2015) 1100-1107

Cuerda-Correa3 1 Department of Mechanical and Materials Engineering, Polytechnic University of Valencia Plaza Ferrandiz y Carbonell, 2; E-03801 Alcoy - Alicante, Spain 2 Department of Materials Science, University of Extremadura, Avda de Elvas s/n E-06071 Badajoz, Spain 3 Department of Organic and Inorganic Chemistry, University of Extremadura, Avda de Elvas s/n E-06071-Badajoz, Spain a amacias@materiales.unex.es Keywords: Cryogenic fibers, Cotton, Rayon, Thermal analysis, Pyrolysis, GC-MS.
The chromatograms corresponding to the cellulosic reference fibers (Fig. 4, left) show a great similarity, since the structure of both fibers is also very similar.
Thoman: Industrial and Engineering Chemistry Vol. 40 (1948) p. 1237 [18] H.
Brownlee: Journal of Macromolecular Science-Chemistry Vol. 7 (1973) p. 281 [20] A.

Effect of Composition of Calcium Lignosulfonate on Setting of Portland Cement with Anhydrite Xiaoping Wanga, Yuxia Pangb, Dongjie Yangc , Hongming Loud and Xueqing Qiue School of Chemistry and Chemical Engineering, State Key Laboratory of Pulp & Paper Engineering, South China University of Technology, Guangzhou, Guangdong, China awangxp88@126.com, bceyxpang@scut.edu.cn, ccedjyang@scut.edu.cn, dcehmlou@scut.edu.cn, exueqingqiu66@163.com Keywords: Calcium lignosulfonate, Portland cement, Quick set, Reducing sugar Abstract.
(China). 1-Phenyl-3-methyl-5-pyrazolone (PMP) was obtained from Aladdin Chemistry Co.
Lignin has the aromatic ring structure and strong UV absorption at wavelength of 280 nm around, while saccharides and inorganic salts have little UV absorption.
Taylor: Cement Chemistry (2nd Ed.)

Introduction As a kind of typical multidisciplinary product, biosensors combine with life science, analytical chemistry, physics, information science and its related technologies, which can also make an rapid analysis and track of required detectable substances [1-4].
Structure, working principle and classification of the microbial sensors Microbial sensor is an analytical device, which use immobilized biomolecules and organisms as sensitive materials, together with electrochemical transducers [13-14].
Journal of Hebei Institute of Chemistry Technology and Light Industry, 1994, 15 (3): 46-49.
Trends In Analytical Chemistry, 1995, 14 (7): 295-299

PtSn/GO Co-Catalyst for Quasi-Solid-State Dye Sensitized Solar Cells Voranuch Somsongkul1,a, Surassawatee Jamikorn2,b, Chanu Photiphitak3,c, Thapanee Sarakonsri4,d, Viratchara Laokawee4,e, Nutpaphat Jarulertwathana4,f, Naruephon Mahamai4,g, Rawinunt Thanachayanont5,h, Suchada Srisakuna5,i, Chris Boothroyd6,j, Taweechai Amornsakchai7,k, Pasit Pakawatpanurat7,l, Pennapa Muthitamongkol8,m, Visittapong Yordsri8,n and Chanchana Thanachayanont8,o* 1Department of Industrial Chemistry, Faculty of Applied Science, King Mongkut's University of Technology North Bangkok, Bangkok, 10800 Thailand 2Faculty of Engineering, Thai-Nichi Institute of Technology, Pattanakarn Rd., Suan Luang, Bangkok 10250 Thailand 3Faculty of Science and Technology, Suan Dusit Rajabhat University, Bangkok, Thailand 4Department of Chemistry, Materials Science Research Center, Faculty of Science, Chiang Mai University, Chiang Mai 50200 Thailand 5Kasetsart University Laboratory School for Educational Research
and Development, Kasetsart University, 50 Phahonyothin Rd., Bangkok 10900 Thailand 6School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, 639798 Singapore 7Department of Chemistry, Faculty of Science, Mahidol University, Rama 6 Rd., Ratchthewee, Bangkok 10400 Thailand 8National Metal and Materials Technology Center, 114 Thailand Science Park, Phahonyothin Rd., Klong 1, Klong Luang, Pathumthani 12120 Thailand avoranuch.s@sci.kmutnb.ac.th, bsurassawatee@tni.ac.th, cchanu_pho@dusit.ac.th, dthapanee.s@elearning.cmu.ac.th, eviratchara022@gmail.com, fbjarulertwathana@gmail.com, gnaruephon_0115@hotmail.com, hrawinunt@gmail.com, iaumsrisakuna@gmail.com, jChrisBoothroyd@cantab.net, ktaweechai.amornsakchai@gmail.com, lpasit.pk@gmail.com, mpennapm@mtec.or.th, nvisittay@mtec.or.th, ochanchm@mtec.or.th Keywords: PtSn, GO, co-catalyst, counter electrode, quasi solid state, dye sensitized solar cell Abstract.
Photocurrent density-voltage (J-V) curves of QSS DSSCs structures of Ag doped TiO2/MgO/PEO electrolyte/ (a) Pt CE and (b) PtSn/GO CE.

When the europium ion is in its +3 oxidation state occupies sites belonging to Sr+2, it causes an imbalance in the total load of the structure, and that this imbalance is minimized defects are formed in the crystal lattice which results in a less crystalline material.
Wang: Journal of Physics and Chemistry of Solids Vol. 66 (2005), p. 1171
Mercier: Chemistry of Materials Vol. 17 (2005), p. 3904
Charbonnière: Current Inorganic Chemistry Vol. 1 (2011), p. 2.

Ion imprinting technology (IIT) is the technology that create multiple action site structures in a polymer matrix, i. e. , IIPs by the copolymerization of functional monomers and cross-linkers in the presence of target ion that act as template molecules based on coordination or electrostatic interactions.
Progress of metal-ion imprinting technology, Chemistry. 73 (2010) 326-331]. 2.2 Preparation of ion imprinting The preparation of imprinted polymers is critical to the whole imprinting process.
Nayak, Metal–organic frameworks for heavy metal removal from water, Coordination Chemistry Reviews. 358 (2018) 92-107
Zhu, Progress of metal-ion imprinting technology, Chemistry. 73 (2010) 326-331

Methodology This research was carried at the Laboratory of Applied Chemistry and Research, Chemical Engineering, University of Lampung.
Based on research of Ersoy and Celik [19], zeolite is an adsorben, ion exchanger, and catalyst that increases organic matters degradation with zeolite structure pore roles.
[13] Rina, U., Modified Zeolite with Nanokitosan As Heavy Metal Ion Adsorbent and Study Kinetikanya Against Ion Pb (II), Faculty of Mathematics and Natural Sciences Graduate Program of Chemistry, Universitas Indonesia, Depok, 2012
[22] Hansson, Anna., Mechanism of Zeolite Activity in Biogas Co-digestion, Department of Physics, Chemistry and Biology, Linkӧping University, Institut of Technology, 2011.

Cationic Gelatin Graft Copolymers: Synthesis, Characterization and Application Ren Junli1,a,*, Peng Xinwen1,b, Sun Runcang1,2,c and Qiu Huayu3,d 1State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, China 2Institute of Biomass Chemistry and Technology, Beijing Forest University, China 3College of Materials, Chemistry and Chemical Engineering, Hangzhou Normal University, Hangzhou, China a,* renjunli@scut.edu.cn (corresponding author), b wenwenpeng1229@163.com, c rcsun@scut.edu.cn, d huayuqiu@163.com Keywords: Gelatin; Cationic graft copolymers; Synthesis; Characterization, Application Abstract.
The structure of graft copolymer was analyzed briefly by the analysis of infrared spectrum, and it was found that monomers (AM and DMC) actually were grafted onto the backbone of gelatin.
Structural diversity of gelatin chain units determines the specific features of gelatin properties, such as the presence of both acidic and basic functional groups in the gelatin macromolecules, its capacity to form a specific triple-stranded helical structure, and its specific interaction with water, those properties do not display in most synthetic polymers.
The structure of the graft copolymer was confirmed by analysis of FT-IR

The preparation and structure characterization of nano-alumina fiber doped cerium by electrospinning Yidong Sun1,a, Weimin Kang 2,b, Bowen Cheng3,c,* 1 Material Engineering College of Tianjin Polytechnic University, Tianjin, 300387, China 2 State Key Laboratory of Hollow Fiber Membrane Materials and Processes, Tianjin Polytechnic University, Tianjin, 300160, China aemail:qsunyidong@163.com bemail:kweimin@126.com cemail:bowen63@126.com * corresponding authors Key words : CeCl3 sol-gel electrospinning alumina nanofiber Abstract.
The structures of the nano-sized alumina fiber were unique as compared to bulk fibers due to their high surface to volume ratio, fiber interconnectivity, micro scale interstitial space and also high porosity.
Textile Research Journal Jan 19, 2011; 159-155 [4] Zhong-Xi Sun, Ting-Ting Zheng: Effects of calcination temperature on the pore size and wall crystalline structure of mesoporous alumina.
Materials Chemistry and Physics 2008; 326–330