complexometric titration
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2020 ◽  
pp. 73-78
Author(s):  
G.V. Nesterov ◽  
T.M. Litvinova

The article presents data on the study of commodity indicators of black, gray and heart-leaved alder leaves harvested from wild plants. The moisture content was determined for all the studied samples. Common ash. Ash insoluble in a 10% solution of hydrochloric acid, organic and mineral impurities, parts of the plant that have lost their natural color. The complexometric titration method determined the content of tannins in the raw material, the content of which in the amount of 4.56 to 8.59%, allows considering this type of raw material as a promising additional source of phytopreparations.


2020 ◽  
Vol 86 (10) ◽  
pp. 18-22
Author(s):  
K. N. Vdovin ◽  
K. G. Pivovarova ◽  
N. A. Feoktistov ◽  
T. B. Ponamareva

Zinc sulfate is the main component in the composition of the acidic zinc plating electrolyte. Deviation in the electrolyte composition from the optimum content leads to destabilization of the electrolysis process and deteriorate the quality of the resulting zinc coating. The proper quality of a zinc coating obtained by galvanic deposition can be ensured only with timely monitoring and adjustment of the electrolyte composition. A technique of X-ray fluorescence determination of zinc (in terms of zinc sulfate) in an acidic zinc plating electrolyte is proposed. The study was carried out using an ARL Quant’X energy dispersive spectrometer (Thermo Fisher Scientific, USA) with a semiconductor silicon-lithium detector. The features of the spectrometer design are presented. The optimal parameters of excitation and detection of zinc radiation were specified when the electrolyte sample was diluted 1:1000. The ZnKα1 line was used as an analytical line. The plotted calibration graph is linear, the correlation coefficient being 0.999234. The results of zinc determination according to the developed method were compared with the data of the reference method of complexometric titration to prove the reliability of the procedure. The results are characterized by good convergence and accuracy. The proposed method of X-ray fluorescence zinc determination in a zinc plating electrolyte equals complexometric titration in the limiting capabilities and even exceeds the latter in terms of the simplicity of sample preparation and rapidity. The developed method of X-ray fluorescence determination of zinc is implemented in analysis of the electrolyte used in the continuous galvanizing unit at «METSERVIS LLC».


2019 ◽  
Author(s):  
Fariha Azalea

An afford to chose the right teaching and learning strategy in the teaching of chemistry topic is very crusial as it is known that chemistry knowledge and skills are involveed. The teaching and learning paradigm have to be ajusted to support the enactment of competence curriculum suited to Indonesian National Qualifications Framework (Kerangka Kualifikasi Nasional Indonesia, KKNI). The policy has been stated in Universitas Negeri Medan to adopt KKNI curiculum, including in Analytrical Chemistry. Therefore, innovation in the teaching and learning have to be made for all subjects in the implementation of a competence-based curriculum suited to KKNI. The aim of the research is to implement an innovative learning material with project to improve students’ performance in the teaching of complexometric titration topic of Analytrical Chemistry. The research steps are consisted of providing sets of mini project on complexometric titration topic, innovation of a learning package with multimedia, and implementation of innovative learning material as learning media in the class. Research results showed that a standard and innovative learning package containing of mini projects for complexometric titration topic have been developed suited to the KKNI curriculum. The project example and the video to do the projects that are provided in the learning package are found effective to guide the students to do the desire project. Integration of multimedia in the learning package has motivated the students to learn the topic and make chemistry easy to learn. An innovative learning material with project has been proved to be able to improve students performance in analytical chemistry procedures. The facility available in a learning package adequate to guide the student to learn chemistry independently and students centre learning style was achieved.


2018 ◽  
Vol 1 (1) ◽  
pp. 14-19
Author(s):  
Devyana Dyah Wulandari

Subdistrict Tanggulangin was relatively close to the source of the Lapindo mud flow, the release of mud content into the water will cause the death of aquatic organisms and lead to serious consequences for humans who depend their life on these waters. Therefore, researchers seek to determine the total water hardness and chloride content in Tanggulangin district. Water make up the population and sample, taken from 15 points in Tanggulangin, Sidoarjo. Total hardness determination was conducted using complexometric titration method, whereas chloride content wasperformed using argentometry Mohr titration method. Water sample from 3 of 10 regions in Tanggulangin is drinkable, namely the sample A (320 mg / L), sample C (170 mg / L), sample E (304 mg / L), sample F (298 mg / L), sample I (372 mg / L), samples J (340 mg / L). While the in the othersamples, the content of total hardness exceeds the maximum threshold (> 500 mg / L) which means unfit for consumption, and 5 of the 10 areas in the district is drinkable, namely the sample A (123.2 mg / L), sample C (49.7 mg / L), sample E (245.7 mg / L), sample I (182.4 mg / L), and samples J (64mg / L).


2018 ◽  
Vol 38 (2) ◽  
pp. 187
Author(s):  
Moh. Taufik ◽  
Seveline Seveline ◽  
Emilia Ratih Saputri

Analysis of calcium content in fresh milk generally uses Atomic Absorption Spectroscopy (AAS). Alternatively, it could be analyzed using complexometric titration. The study aimed to validate the method of calcium content analysis in fresh milk by complexometric titration. The results showed that the linearity test using calcium standard solution at a working range of 4-24 mg/100 mL had R2 of 0.9983, while the limit of detection and limit of quantification were 0.47 mg/100 mL and 1.57 mg/100 mL, respectively. The accuracy by spiking method at the spiking concentration of 60 mg/100 mL sample was 99.29%. The repeatability and intra-lab reproducibility showed acceptable precision with CV value of 0.98% and 2.59%, respectively. The results of ruggedness test showed that this method was rugged to the variation of sample volume and ethylenediaminetetraacetic acid (EDTA) concentration. This study proved that complexometric titration can be used to determine calcium content in fresh milk. ABSTRAKAnalisis kadar kalsium pada susu segar umumnya menggunakan Atomic Absorption Spectroscopy (AAS) yang relatif mahal. Salah satu metode alternatif yang dapat digunakan adalah titrasi kompleksometri. Sampai sekarang, data validasi terhadap metode tersebut pada sampel susu segar belum tersedia. Tujuan penelitian ini adalah memvalidasi metode analisis kadar kalsium pada susu segar secara titrasi kompleksometri. Hasil penelitian menunjukkan uji linearitas dengan menggunakan larutan standar kalsium pada rentang 4-24 mg/100 mL mempunyai nilai R2 sebesar 0,9983, sedangkan nilai batas deteksi dan batas kuantifikasi berturut-turut adalah 0,47 mg/100 mL dan 1,57 mg/100 mL. Nilai akurasi (recovery) sebesar 99,29% pada konsentrasi spiking 60 mg/100 mL sampel. Hasil penelitian atau metode uji yang divalidasi menunjukkan nilai keterulangan dan reprodusibilitas intralab yang baik dengan nilai CV analisis berturut-turut 0,98% dan 2,59%. Hasil uji ketangguhan menunjukkan metode ini bersifat tangguh (rugged) terhadap variasi volume sampel dan konsentrasi asam etilenadiaminatetraasetat (EDTA) yang digunakan. Berdasarkan hasil penelitian tersebut, metode titrasi kompleksometri dapat digunakan untuk menentukan kadar kalsium pada susu segar.  


2018 ◽  
Vol 10 (2) ◽  
pp. 01-06
Author(s):  
Débora Regina Lopes ◽  
Maurício Augusto de Oliveira ◽  
Daniel Ângelo Macena ◽  
Vinícius Marques Gomes

The antiperspirant works by diffusing the aluminum salt through the ducts of the sweat glands into the opening of the epidermis. After contact with perspiration sweat, a mucopolysaccharide complex is produced that reduces perspiration. When its content is high in blood, the bones capture and release it slowly causing bone dystrophy. The objective of this project was to determine the levels of aluminum in the antiperspirant, of different brands marketed in supermarkets, and to verify if the concentrations are in agreement with the label and in accordance with the legislation. The complexometric titration method was used. Of the three brands analyzed, the first one did not present aluminum, important for the antiperspirant effect, the second one contained lower amounts than the one informed on the label and the third one presented levels above that allowed by the legislation. Therefore, none of the analyzed brands presented positive results.


Author(s):  
Jafar La Kilo

The main need of clean water on Universitas Muhammadiyah Gorontalo (UMGo) especially for bathing, washing and toileting from the groundwater. To utilizing groundwater must to heed water quality. Water quality determined by physical, chemical, and biology parameters. One of this parameters is hardness. Water with very high degrees of hardness is harmful to environment and health. Analysis of hard water degrees from groundwater on Universitas Muhammadiyah Gorontalo area with complexometric titration method has been done. The result shows that degrees of hard water in Yusuf Polapa Mosque, Faculty of agriculture, rectorat, and AMCF building respectively 59,0 mg/L; 74,2 mg/L; 74,0 mg/L dan 57,8 mg/L. This result categorize as soft water. The degrees of hardness in canteen is 81,8 mg/L or moderate water. Therefore, groundwater in Universitas Muhammadiyah Gorontalo area is safe for daily and industry need. Kebutuhan air bersih di lingkungan Universitas Muhammadiyah Gorontalo (UMGo) khususnya mandi, cuci dan kakus (MCK) bersumber dari air tanah. Dalam pemanfaatan air tanah perlu diperhatikan parameter kualitas air. Kualitas air yang baik ditentukan oleh parameter fisika, kimia, dan biologi. Salah satu parameter tersebut adalah tingkat kesadahan. Air tanah yang mengandung tingkat kesadahan yang tinggi dapat berdampak buruk bagi lingkungan dan kesehatan. Telah dilakukan analisis tingkat kesadahan air tanah pada 5 (lima) titik di lingkungan Universitas Muhammadiyah Gorontalo dengan metode titrasi kompleksometri. Berdasarkan hasil analisa, tingkat kesadahan air tanah di Masjid Yusuf Polapa, gedung Fakultas pertanian, gedung rektorat dan gedung AMCF masing-masing adalah 59,0 mg/L; 74,2 mg/L; 74,0 mg/L dan 57,8 mg/L, masuk dalam kategori dengan tingkat kesadahan rendah. Tingkat kesadahan air tanah di sekitar kantin dalam kategori sedang yaitu sebesar 81,8 mg/L. Dengan demikian, air tanah di lingkungan kampus Universitas Muhammadiyah Gorontalo aman digunakan untuk keperluan sehari-hari dan keperluan industri.


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