scholarly journals Study on the Factors Affecting the Determination of Calcium in Limestone for Chemical Industry by AAS

2021 ◽  
Vol 245 ◽  
pp. 03084
Author(s):  
Wen He ◽  
Chengfeng Dang ◽  
Xing Gao
Keyword(s):  
Chemical Industry ◽  
Calcium Content ◽  
Absorption Spectrometry ◽  
Optimum Conditions ◽  
Soaking Time ◽  
Factors Affecting ◽  
Controlling Variables ◽  
Easy Operation ◽  
Soaking Temperature

The calcium content in limestone for chemical industry was determined by atomic absorption spectrometry. The effects of soaking time, soaking reagent and soaking temperature on the determination of calcium content in limestone for chemical industry were discussed by the method of controlling variables, and the optimum conditions for the determination of calcium content in limestone for chemical industry were analyzed. This method has the advantages of easy operation, low interference, high accuracy and sensitivity, and is widely used. The experimental results show that the optimum conditions for the determination of calcium content in limestone for chemical industry are as follows: soaking reagent is 0.6mol/L hydrochloric acid, soaking time is 0.5h, soaking temperature is 70～80 ℃.

Atomic absorption spectrometry of cobalt in the presence of chelating agents

1980 ◽  
Vol 45 (12) ◽  
pp. 3313-3319 ◽  
Author(s):  
Josef Komárek ◽  
Dalibor Kolčava ◽  
Lumír Sommer
Keyword(s):  
Reaction Mechanism ◽  
Atomic Absorption Spectrometry ◽  
Atomic Absorption ◽  
Chelating Agents ◽  
Absorption Spectrometry ◽  
Donor Atom ◽  
Optimum Conditions

The effect of chelating agents on the determination of cobalt in various flames, in a graphite cuvette and tantalum boat was studied considering the expected reaction mechanism of the atomization of cobalt and the reagent donor atom. A marked increase in the sensitivity of the determination of cobalt was observed in the presence of 1-(2-pyridylazo)-2-naphthol, pyrrolidinedithiocarboxylate, diethyldithiocarbamate, 8-mercaptoquinoline, 8-hydroxyquinoline and thenoyltrifluoroacetone for atomization from a tantalum boat. The optimum conditions for the determination of cobalt in the presence of 1-(2-pyridylazo)-1-naphthol are given.

The preparation of transforming DNA from Mycoplasma hominis strain Sprott tetr and quantitative studies of the factors affecting the genetic transformation of Mycoplasma salivarium strain S9 tets to tetracycline resistance

1980 ◽  
Vol 26 (9) ◽  
pp. 1147-1152 ◽  
Author(s):  
Anna M. Cerone-McLernon ◽  
Geoffrey Furness
Keyword(s):  
Genetic Transformation ◽  
Tetracycline Resistance ◽  
Mycoplasma Hominis ◽  
Dna Uptake ◽  
Optimum Conditions ◽  
Factors Affecting ◽  
Quantitative Studies ◽  
Viable Cells ◽  
Calf Thymus

DNA extracted by a standard method from Mycoplasma hominis Sprott, resistant to 100 μg tetracycline, permitted the quantitative genetic transformation of tetracycline-sensitive Mycoplasma salivarium to resistance. The yield was 1 μg DNA/109 cells. This DNA enabled determination of the optimum conditions for making M. salivarium competent with CaCl2 and for studying some factors affecting transformation. Mycoplasma salivarium was transformed to resistance to 10, 20, and 30 μg tetracycline but not to 40 μg. The optimum DNA concentration for transforming resistance to 10, 20, and30 μg tetracycline was the same, i.e., 50 μg DNA/108 viable cells. Treatment with DNase indicated that DNA uptake took 30 min. Competition between transforming DNA and DNA from calf thymus and M. salivarium tets inhibited transformation.

scholarly journals Spectrophotometric Determination of Copper(II) using 2,2[O-Tolidine-4,4-bis azo]bis[4,5-diphenyl imidazole](MBBAI)

2020 ◽  
Vol 17 (1(Suppl.)) ◽  
pp. 0287
Author(s):  
Ihsan Mahdi Shaheed
Keyword(s):  
Limit Of Detection ◽  
Ph Effect ◽  
Stoichiometric Composition ◽  
Optimum Conditions ◽  
Limit Of Quantification ◽  
Factors Affecting ◽  
Dental Filling ◽  
Concentration Time ◽  
Determination Of Copper

            Spectrophotometric method was developed for the determination of copper(II) ion. Synthesized (2,2[O-Tolidine-4,4-bis azo]bis[4,5-diphenyl imidazole]) (MBBAI) was used as chromogenic reagent at pH=5. Various factors affecting complex formation, such as, pH effect, reagent concentration, time effect and temperature effect, have been considered and studied. Under optimum conditions concentration ranged from (5.00-80.00) µg/mL of copper(II) obeyed Beer`s Low. Maximum absorption of the complex was 409nm with molar absorpitivity 0.127x104 L mol-1 cm-1. Limit of detection(LOD) and Limit of quantification were 1.924 and 6.42 μg/mL, respectively. The stoichiometric composition of the chelate is 1:2 (Cu:MBBAI). Experimental results for studying some selected ions as interference were reported. The developed method was successfully applied to determine copper (II) ion in dental filling.  

scholarly journals The impact of (Canarium Odontophyllum Miq.) Dabai Optimum Soaking Condition Towards the Development of Dabai Peanut Spread Physicochemical Properties and Sensory Evaluation

2021 ◽  
Vol 12 (2) ◽  
pp. 56-67
Author(s):  
Abdul Fattah Ab Razak ◽  
Mohd Zahid Abidin ◽  
Norhasmillah Abu Hassan ◽  
Josephine Anak Edwin ◽  
Mohd Syafiq Abdullah ◽  
...  
Keyword(s):  
Sensory Evaluation ◽  
Crude Protein ◽  
Food Product ◽  
Roasted Peanut ◽  
Soaking Time ◽  
Canarium Odontophyllum ◽  
The Impact ◽  
Potential Food ◽  
Soaking Temperature

Canarium odontophyllum miq. also known as dabai is known as Sarawak indigenous fruit and utilised for dabai peanut spread formulation. Dabai is physically hard in texture and consumed by soaking under heat treatment. Therefore, dabai optimum soaking condition is determined followed by the development of dabai peanut spread. The determination of soaking condition requires: soaking time (2, 4, 6, 8, 10 and 12) mins and soaking temperature (50°C, 60°C, 70°C and 80°C) as independent variables, and (water absorption, crude protein content, crude fat content, moisture content, ash content and colour) as dependent variables. 50°C for 4 minutes is the optimum dabai soaking condition, and it is being utilised for dabai peanut spread formulation. There were six different formulations with different ratios of soaked dabai and roasted peanut, and further underwent proximate analyses and sensory evaluation test. The combination of a low amount of soaked dabai (40 g) with a high amount of roasted peanut (160 g) has produced a high amount of crude protein (10.65%) and crude fat (35.95%) and was found significantly (p<0.05) acceptable by the panellists. The information obtained provides a better understanding of dabai as a potential food product ingredient.

scholarly journals EXTRACTION CONCENTRATING OF SCANDIUM (III) IN COMPLEX FORM WITH 2-HYDROXY-5-T-BUTYLPHENOL-4-METOXYAZOBENZENE AND ITS DETERMINATION BY ATOMIC-ABSORPTION SPECTROMETRY

2021 ◽  
Vol 0 (4) ◽  
pp. 49-52
Author(s):  
A.M. Pashajanov ◽  
◽  
S.I. Niftaliyev ◽  
M.M. Agamaliyeva ◽  
S.M. Bayramov ◽  
...  
Keyword(s):  
Stability Constant ◽  
Atomic Absorption ◽  
Complex Form ◽  
Absorption Spectrometry ◽  
Optimum Conditions ◽  
Spectrophotometric Methods ◽  
Atomic Absorption Determination ◽  
Absorption Determination ◽  
Light Absorbance

Complexation of scandium 2-hydroxy-5-T-butylphenol-4-metoxyazobenzene (HR) was studied by atomic-absorption and spectrophotometric methods. Optimum conditions of formation and extraction of the complex were found. Maximum light absorbance of a complex in n-butanol is in the range of 470÷480 nm. Molar absorption coefficient equals to (2.2–3.0).104. Stability constant of scandium in n-butanol is л=2.8·1010. Selective and sensitive techniques of extraction-atomic absorption determination of scandium in soils were developed

scholarly journals Solid phase extraction and preconcentration of Ni(II) using 1-(2-pyridylazo)-2-naphthol) (PAN) modified β-cyclodextrin butanediol diglycidyl ether polymer as a solid phase extractant

2013 ◽  
Vol 32 (1) ◽  
pp. 57 ◽  
Author(s):  
Sandeep Jaggi ◽  
Usha Gupta
Keyword(s):  
Potato Chip ◽  
Solid Phase ◽  
Diglycidyl Ether ◽  
Optimum Conditions ◽  
Factors Affecting ◽  
Relative Standard ◽  
Potential Factors ◽  
Solid Phase Extractant ◽  
Preconcentration Method

A sensitive, simple and selective preconcentration method was developed for the preconcentration of trace amounts of Ni(II) ions using 1-(2-pyridylazo)-2-naphthol (PAN) modified β-cyclodextrin butanediol diglycidyl ether polymer as a solid phase extractant. Potential factors affecting the sorption of Ni(II) were investigated. Meanwhile, the optimum conditions were established. The sorbed Ni(II) was eluted using 5 ml of 2 M HCl. The preconcentrtion factor was 70. The detection limit for Ni(II) was 1.18 ng/ml. The relative standard deviation (RSD %) was >1%. The developed method was successfully applied for the determination of trace Ni(II) in different water and potato chip samples as well as reference alloy samples.

scholarly journals Solidified Floating Organic Drop Microextraction for the Detection of Trace Amount of Lead in Various Samples by Electrothermal Atomic Absorption Spectrometry

2017 ◽  
Vol 2017 ◽  
pp. 1-7 ◽  
Author(s):  
Oya Aydın Urucu ◽  
Şeyda Dönmez ◽  
Ece Kök Yetimoğlu
Keyword(s):  
Standard Deviation ◽  
Electrothermal Atomic Absorption Spectrometry ◽  
Chelating Agent ◽  
Absorption Spectrometry ◽  
Food Samples ◽  
Lead Ion ◽  
Optimum Conditions ◽  
Relative Standard ◽  
Novel Method

A novel method was developed for determination of trace amounts of lead in water and food samples. Solidified floating organic drop microextraction was used to preconcentrate the lead ion. After the analyte was complexed with 1-(2-pyridylazo)-2-naphthol, undecanol and acetonitrile were added as extraction and dispersive solvent, respectively. Variables such as pH, volumes of extraction and dispersive solvents, and concentration of chelating agent were optimized. Under the optimum conditions, the detection limit of Pb (II) was determined as 0.042 µg L−1 with an enrichment factor of 300. The relative standard deviation is <10%. Accuracy of the developed procedure was evaluated by the analysis of certified reference material of human hair (NCS DC 73347) and wastewater (SPS-WW2) with satisfactory results. The developed procedure was then successfully applied to biscuit and water samples for detection of Pb (II) ions.

Determination of molybdenum in rocks by atomic absorption spectrometry with electrothermal atomization after its separation with α-benzoinoxime

1984 ◽  
Vol 49 (2) ◽  
pp. 370-377 ◽  
Author(s):  
Dalibor Kolčava ◽  
Jan Janáček
Keyword(s):  
Hydrochloric Acid ◽  
Atomic Absorption Spectrometry ◽  
Atomic Absorption ◽  
Tartaric Acid ◽  
Graphite Furnace ◽  
Accurate Determination ◽  
Absorption Spectrometry ◽  
Electrothermal Atomization ◽  
Optimum Conditions

A method has been worked out for a sensitive and accurate determination of molybdenum in rocks in contents of the order of 10-1 g/t. The sample is decomposed with acids and molybdenum is separated from practically all other elements by extraction with α-benzoinoxime from solution of 1.5 M hydrochloric acid and 0.13 M tartaric acid into chloroform, and determined in the extract by AAS with electrothermal atomization. The quantitativeness of the extraction has been examined and the optimum conditions for the determination in a graphite furnace have been established. The effects of chloroform and of the graphite atomizer on the signal of molybdenum have been investigated, and the accuracy of the method has been tested on GXR geochemical standards.

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