scholarly journals Determination of Ca3(PO4)2 in Bone China by Microwave Digestion-ICP-AES

2021 ◽  
Vol 245 ◽  
pp. 03088
Author(s):  
Zheng-gen Huang ◽  
He-ying Yi ◽  
Tao Wang ◽  
Lian-ying An ◽  
Xiao-bin Zhao
Keyword(s):  
Detection Limit ◽  
Tricalcium Phosphate ◽  
Microwave Digestion ◽  
Test Method ◽  
National Standard ◽  
Good Precision ◽  
Test Results ◽  
Established Method ◽  
Bone China

The establishment of a microwave digestion method with the advantages of simple operation and complete digestion to process samples has shown that, high sensitivity, wide linear dynamic range, good precision, fast analysis speed and many other advantages of ICP-AES technology for rapid determination of tricalcium phosphate in bone china. Through the use of different P2O5 content of phosphate rock and kaolin national standard material configuration standard working solution for matrix matching to eliminate matrix interference, the microwave digestion sample processing condition selection, coexisting ion interference, method precision, accuracy, and detection limit tests were carried out. The results showed that the detection limit of the newly established method for tricalcium phosphate is 0.011mg.L-1; the HCl-HNO3-HF-H2O2 mixed acid decomposition system dissolves the best samples; the interference of the test results through the matrix matching coexisting ion pair is small; The relative standard deviation (RSD) is 1.08%~4.64%, and the recovery rate of standard addition is 92.4%~107.9%. The established method has high accuracy and precision; the bone china samples are analyzed and compared with the conventional digestion national standard method The t test method is used to prove that the two methods are not significantly different from the test results.

Determination of the Emission of Volatile Organic Compounds from Leather Seats in Environmental Test Chamber

2018 ◽  
Vol 768 ◽  
pp. 31-35
Author(s):  
Jin Wang ◽  
Zhen Zhu Ma ◽  
Lu Chen ◽  
Hong Juan Sun ◽  
Wu Kun Fan
Keyword(s):  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Test Chamber ◽  
Paper Analysis ◽  
National Standard ◽  
Test Results ◽  
Total Volatile Organic Compound ◽  
Volatile Organic ◽  
Environmental Test

With reference to the international standard ISO16000-9 and the national standard GB/T 31106-14, this paper has chosen leather seats as the research object in order to study the emission of volatile organic compounds (VOCs) and total volatile organic compound (TVOC). The test results show that about 21 species of VOCs released from the leather seats were measured, including several types of aldehydes, ketones, aromatic hydrocarbon ,hydrocarbon, lipids and so on.This paper analysis the possible sources of volatile organic compounds in leather seats as well.

The Removal of Interference from Microwave Digestion Solution of Industrial Wastewater on the Determination of Arsenic

2014 ◽  
Vol 587-589 ◽  
pp. 625-628
Author(s):  
Ming Ming Yang ◽  
Hong Wei An
Keyword(s):  
Detection Limit ◽  
Microwave Digestion ◽  
Hydride Generation ◽  
Standard Addition ◽  
Absorption Spectrometry ◽  
Quantitative Detection ◽  
Nitrite Ion ◽  
Digestion Solution ◽  
Relative Standard

In existing literature ,there is no unified time for the evaporating excessive acid to microwave digestion solution of different samples. a new method was developed .The interference from nitrite ion and volatile nitrogen oxides which were generated during digestion were quickly removed by the adding urea and heating with boiling water. The interference from nitrate was studied. Optimized conditions of determination of arsenic with hydride generation atomic absorption spectrometry. The detection limit was 0.3μg·L-1 and minimum quantitative detection limit was 1.0μg·L-1, the relative standard deviation of standard addition method in sample was 1.1% and recovery from 98 % to 102%.

Fluorimetric Method for the Determination of Trace Amounts of Molybdenum Using 2-Hydroxy-1-Naphthaldehydene-p-Aminotoluene

2014 ◽  
Vol 556-562 ◽  
pp. 584-587 ◽  
Author(s):  
Wei Wei Bian
Keyword(s):  
Detection Limit ◽  
Cation Exchange ◽  
Good Precision ◽  
Pig Liver ◽  
Fluorimetric Method ◽  
Ethanol Medium ◽  
Spectrofluorimetric Method ◽  
Highly Sensitive ◽  
Precision And Accuracy

A new fluorescent reagent, 2-hydroxy-1-naphthaldehydene-p-aminotoluene, was synthesized. The fluorescent reaction of this reagent with molybdenum was studied. Based on this chelation, a highly sensitive spectrofluorimetric method was developed for determination of trace amounts of molybdenum in a water-ethanol medium at pH 6.8. Under these conditions, the Mo-HNA complex has excitation and emission maxima at 300 and 380 nm, respectively. The linear range of the method is 0-2μg/L and the detection limit is 0.62μg/L. Interference of other ions was studied. It is necessary to remove the interfering cations through cation exchange. The procedure can be carried out easily and affords good precision and accuracy. This method has been successfully applied to the determination of molybdenum in pig liver and mussels.

Comparison of Spectrophotometry, FAAS and ICP-OES Methods for the Determination of Trace Iron in Solar Glass

2013 ◽  
Vol 787 ◽  
pp. 163-166
Author(s):  
Yan Gang Han ◽  
Hong Bo Chen ◽  
Jing Peng ◽  
Hao Ding ◽  
Qiao Sang He
Keyword(s):  
Solar Cells ◽  
Detection Limit ◽  
Optical Absorption ◽  
Iron Content ◽  
Analytical Methods ◽  
National Standard ◽  
Icp Oes ◽  
Testing Method ◽  
Accuracy And Precision

Solar glass of low iron content plays an important role to increase the optical absorption of solar cells. The national standard stipulates the iron content in the glass without specified testing method. In this paper, we conducted three parallel analytical methods (1,10-Phenanthroline spectrophotometry, FAAS and ICP-OES) to determine the iron content in the same glass and evaluated the results in terms of detection limit, accuracy and precision. Although all three methods can detect the existence of iron, the analytical results are different to some extent. At last we propose a preferred method for commercial solar glass monitoring.

scholarly journals Validasi Metode Penentuan Mn Dalam Oli Lubrikan Dengan Metode Pengenceran Langsung Menggunakan Spektrofotometer Serapan Atom

2019 ◽  
Vol 6 (2) ◽  
pp. 94-100
Author(s):  
Rona Maningting Napitupulu ◽  
Dirgarini Julia ◽  
Aman S. Panggabean
Keyword(s):  
Detection Limit ◽  
Limit Of Detection ◽  
Lubricating Oil ◽  
Dilution Method ◽  
Good Precision ◽  
Validation Method ◽  
Limit Of Quantitation ◽  
Environment Control ◽  
Repeatability And Reproducibility

Validation method on the determination of Mn in lubricating oil by direct dilution method using Atomic Absorption Spectrophotometer (AAS) in Laboratory & Environment Control PT. Badak NGL Bontang has been done The validation method was done with research stages such as determination of  optimum solvent, and determination of some important parameters influential for validation method such as parameter of liniearitas (r), Instrument Detection Limit (IDL), Methode Detection Limit (MDL), accuracy, precision, Limit of Detection(LOD) and Limit of Quantitation(LOQ). The result of research obtain is good, showed that the linearity value with R2 ≥ 0,997. The IDL and MDL value was 0.0021 ppm and 0.0092 ppm respectively and has been acceptability requirements of MDL. The accuracy paramater obtained recovery value with range 82.25-88.34%. The measurement of repeatability and reproducibility, the CV Horwitz value smaller than % RSD, indicating the method had a good precision. The measurement of  LOD and LOQ value was 0.095 ppm 0.317 ppm respectively. Based on the result of the research determination method of Mn in lubricating oil by direct dilution method using AAS concluded valid.

scholarly journals Determination of titanium dioxide in cement by Microwave Digestion-VIS Spectrophotometry

2021 ◽  
Vol 236 ◽  
pp. 02038
Author(s):  
Zheng-gen Huang ◽  
Tao Wang ◽  
Xiao-bin Li ◽  
Bei-jia Li
Keyword(s):  
Titanium Dioxide ◽  
Microwave Digestion ◽  
New Method ◽  
National Standard ◽  
Standard Reference Materials ◽  
Significant Difference ◽  
Student’S T ◽  
Working Parameters ◽  
Certified Values

A new method to determine titanium dioxide in cement by Microwave Digestion-DAPM VIS Spectrophotometry which has many advantages such as simple operation, safe and fast, dissolve completely is presented in this paper. The determination conditions and working parameters of the microwave digestion instrument including the species and dosage of digestion reagent, wavelength, reaction time and the dosage of DAPM were optimized. The results show that samples were dissolved by HNO3-HF-H2O2, 395nm as the wavelength and 12mL of DAPM. The method has been validated by determination of titanium dioxide in national standard reference materials of GBW03201, GBW03201c, GBW03207 and GBW03205. The results were in agreement with certified values and the RSD was 1.07%-4.52%. The recovery ratio was ranging from 91.8% to 108.0% and the ｜△lgC｜was less than 0.018. Comparison with the traditional digestion method that analytical cement samples of Sichuan, there is no significant difference between the two methods by Student's t test. This new method provide a new way for quick and accurate to determine the content of titanium dioxide in cement.

scholarly journals Using N-doped Carbon Dots Prepared Rapidly by Microwave Digestion as Nanoprobes and Nanocatalysts for Fluorescence Determination of Ultratrace Isocarbophos with Label-Free Aptamers

Nanomaterials ◽  
2019 ◽  
Vol 9 (2) ◽  
pp. 223 ◽  
Author(s):  
Xin Li ◽  
Xin Jiang ◽  
Qingye Liu ◽  
Aihui Liang ◽  
Zhiliang Jiang
Keyword(s):  
Catalytic Activity ◽  
Detection Limit ◽  
Fluorescent Probe ◽  
Carbon Dots ◽  
Rapid Determination ◽  
Microwave Digestion ◽  
Label Free ◽  
Laser Scattering ◽  
Doped Carbon Dots

The strongly fluorescent and highly catalytic N-doped carbon dots (CDN) were rapidly prepared by a microwave irradiation procedure and were characterized by electron microscopy (EM), laser scattering, infrared spectroscopy (IR), and by their fluorescence spectrum. It was found that the CDN had a strong catalytic effect on the fluorescence reaction of 3,3′,5,5′-tetramethylbenzidine hydroxide ((TMB)–H2O2) which produced the oxidation product of TMB (TMBOX) with strong fluorescence at 406 nm. The aptamer (Apt) was adsorbed on the CDN surfaces which weakened the fluorescence intensity due to the inhibition of catalytic activity. When the target molecule isocarbophos (IPS) was added, it reacted with the Apt to form a stable conjugate and free CDN which restored the catalytic activity to enhance the fluorescence. Using TMBOX as a fluorescent probe, a highly sensitive nanocatalytic method for determination of 0.025–1.5 μg/L IPS was established with a detection limit of 0.015 μg/L. Coupling the CDN fluorescent probe with the Apt–IPS reaction, a new CD fluorescence method was established for the simple and rapid determination of 0.25–1.5 μg/L IPS with a detection limit of 0.11 μg/L.

Automated Spectrophotometric Method Using 2,2’-Dithiodipyridine Acid for Determination of Cholinesterase in Whole Blood

1996 ◽  
Vol 79 (3) ◽  
pp. 757-763 ◽  
Author(s):  
Jose J Cerón ◽  
María J Fernandez Del Palacio ◽  
Luis J Bernal ◽  
Cándido Gutierrez
Keyword(s):  
Detection Limit ◽  
Spectrophotometric Method ◽  
Whole Blood ◽  
Cholinesterase Activity ◽  
New Method ◽  
Good Precision ◽  
Throughput Rate ◽  
Nitrobenzoic Acid ◽  
Automated Method

Abstract An automated method using 2,2’-dithiodipyridine (2-PDS) as chromophore for determination of wholeblood cholinesterase activity was developed. Assay procedures, optimal concentrations of chromophore and substrate, detection limit, precision, backgrounds, and sensitivity of the method were compared with those of an earlier automated method based on the Eilman method and using 5,5’-dithiobis(2-nitrobenzoic acid) (DTNB) as chromophore. The new method has the advantages of automation (resulting in increase throughput rate and decrease in amount of reagents used) and good precision and sensitivity. Sample dilutions also are reduced in the new method because hemoglobin interference is less.

scholarly journals Validation of Rock Testing Methods in Determination of Apparent Density

2018 ◽  
Vol 66 ◽  
pp. 02003
Author(s):  
Joanna Hydzik-Wiśniewska ◽  
Sebastian Olesiak
Keyword(s):  
Research Methods ◽  
Apparent Density ◽  
Test Method ◽  
Systematic Evaluation ◽  
Test Results ◽  
Factors Affecting ◽  
Testing Procedures ◽  
Precision Evaluation ◽  
Mathematical Formulas

Research on the physical properties of rock materials and aggregates used for construction should be based on standardized methods. Whereas scientific research is focused more on the development of new methods, testing and evaluation of new properties, etc. In case of own testing procedures and standardized but modified methods, they should be validated before being put into use. Validation is the confirmation of the ability to designate that method and tests its usefulness. In order to investigate the method's possibilities, the following assessment methods can be used: calibration or precision evaluation using reference standards or reference materials, systematic evaluation of factors affecting the result, resistance of the test method to variability of controlled parameters, comparison of test results obtained by various methods, inter-laboratory comparisons, and uncertainty of measurement. The paper presents mathematical formulas allowing to evaluate the precision of research methods and the consistency of results, which are the basis for validation of research methods. In the practical part of the article, own method of apparent density testing, was validated based on the analysis of repeatability, internal laboratory reproducibility and between laboratory reproducibility.

ICP-AES Determination of Sulfide and Sulfate Content in Pebble and Crushed Stone

2017 ◽  
Vol 726 ◽  
pp. 70-74
Author(s):  
Qian Nan Li ◽  
Man Li ◽  
Qing Dan Yuan ◽  
Dan Hua Xu
Keyword(s):  
Sulfur Trioxide ◽  
National Standard ◽  
Crushed Stone ◽  
Test Results ◽  
Sulfate Content ◽  
Pretreatment Method ◽  
Relative Standard ◽  
Weight Method ◽  
Sulphur Trioxide

Generally, the content of sulfide and sulfate (expressed as a sulphur trioxide) in pebble and crushed stone for construction is low. So use the weight method specified in the national standard method for determination, is not only tedious and time consuming, but also not accurate enough. In this paper, with reference to the pretreatment method of the relevant national standard, rapid and accurate test results can usually be obtained for the determination of sulfur trioxide in and crushed stone for construction by using ICP-AES as a new method, greatly reducing the time of the experiment and improve the efficiency. According to the analysis of spectrum interference, 182.0 nm was selected as the best analysis of spectral line for sulfur. The detection line of this method (3S) was 0.016 mg/L, the recovery rate of the sample was between 93.3%-104.0%, and the relative standard deviation (n=6) of the parallel samples was less than 1.05%.

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