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 SEQUENTIAL MULTI-ELEMENT DETERMINATION OF TRACE-METALS IN BIODIESEL SAMPLES USING HR-CS FAAS

Química Nova ◽  
2020 ◽  
Author(s):  
Alexandre Jesus ◽  
Ariane Zmozinskia ◽  
Diane Laroque ◽  
Márcia Silva
Keyword(s):  
Absorption Spectrometry ◽  
Element Determination ◽  
Continuum Source ◽  
Flame Atomic Absorption ◽  
Student’S T ◽  
Different Sources ◽  
Certified Values ◽  
Good Agreement ◽  
Student’S T Test

In this work the feasibility of sequential multi-element determination of Zn, Fe, Mg, Cu, Na, K, Cr, Al and Ca in biodiesel samples by high-resolution continuum source flame atomic absorption spectrometry (HR-CS FAAS) was investigated. Biodiesel samples obtained from different sources and different chemical processes were analysed. The samples were diluted with n-propanol and water (1.4 mol L-1 HNO3) to form a microemulsion (ME) before its introduction in the HR-CS FAAS using a flow injection mode. The sample B-01 (obtained from soybean oil) was used for optimisation of the instrumental parameters. The accuracy of the proposed method was checked by analysis of certified reference material (CRM) Conostan BDM2A (for K and Na) and BDM2B (for Ca and Mg) and by comparison with acid digestion and recovery tests (for Zn, Fe, Cu, Cr and Al). The obtained results for CRM analysis showed good agreement with certified values within 95% of confidence (Student’s t-test). Recovery tests values ranged from 87-114%. The method developed for the analysis of biodiesel samples is accurate, simple, fast, and suitable for routine application.

CuSO4-TiO2 as Kjeldahl Digestion Catalyst in Manual Determination of Crude Protein in Animal Feeds

1986 ◽  
Vol 69 (4) ◽  
pp. 664-666
Author(s):  
Peter F Kane
Keyword(s):  
Standard Deviation ◽  
Crude Protein ◽  
T Test ◽  
Environmental Concerns ◽  
Animal Feeds ◽  
Significant Difference ◽  
Kjeldahl Digestion ◽  
Student’S T ◽  
Student’S T Test

Abstract The official AOAC manual Kjeldahl methods for determining crude protein in animal feeds have several disadvantages. For the HgO catalyst method, there are environmental concerns and a lengthy digestion. For the CuS04 catalyst method, the digestion period is shorter, but still 90 min. A different catalyst combination, CuS04-Ti02, makes 40 min digestion feasible. Comparison of these catalysts on a group of representative feeds resulted in a mean difference, Cu-Ti minus HgO, of 0.034% protein. Standard deviation of the differences was 0.36. A Student’s t-test showed no significant difference. The method will be collaboratively studied.

scholarly journals Development of an Ultraviolet Spectrophotometric Method for the Determination of Ceftiofur Sodium Powder

2009 ◽  
Vol 92 (6) ◽  
pp. 1673-1680 ◽  
Author(s):  
marinês J E Souza ◽  
Natália Canedo ◽  
Paulo S Souza Filho ◽  
Ana M Bergold
Keyword(s):  
Spectrophotometric Method ◽  
Spectrophotometric Analysis ◽  
Uv Spectrophotometry ◽  
Accuracy And Precision ◽  
Significant Difference ◽  
Student’S T ◽  
Ceftiofur Sodium ◽  
Interday Precision ◽  
Student’S T Test

Abstract A UV spectrophotometric method was developed for determination of ceftiofur sodium in the drug substance and sterile powder for injection. The method validation, which yielded good results, included evaluation of the range, linearity, intraand interday precision, accuracy, recovery, specificity, robustness, LOQ, and LOD. The UV spectrophotometric determinations were performed at 292 nm. Good linearity was obtained between 2.5 and 20.0 g/mL. A prospective validation showed that the method is linear (r = 0.9999) and precise, with RSD values of 0.3 for product A and 0.4 for product B. The intraand interday precision values were <2 for all samples analyzed. Comparison of UV spectrophotometry and LC by analysis of variance and Student's t-test showed no significant difference between methodologies. Moreover, the accuracy and precision obtained with the UV method correlated well with the values obtained with the LC method, and this correlation suggests that UV spectrophotometric analysis can be an inexpensive, reliable, and less time-consuming alternative to chromatographic analysis. The results demonstrated the validity of the proposed method as a simple and useful alternative for the determination of ceftiofur in routine QC analyses.

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.

Direct and Sequential Determination of Six Metal Elements in Cooking Wine by HR-CS GFAAS

2014 ◽  
Vol 1033-1034 ◽  
pp. 658-662 ◽  
Author(s):  
An Hui Chen ◽  
Shang Long Chen ◽  
Yong Hua Wu ◽  
Ying Shao ◽  
Chuan Li Zhang
Keyword(s):  
Microwave Digestion ◽  
Correlation Coefficients ◽  
Scientific Basis ◽  
Continuum Source ◽  
Food Industries ◽  
Metal Elements ◽  
Significant Difference ◽  
Varied Form ◽  
Pre Treatment

The aim of this work was to develop a sensitive, simple and direct procedure for the determination of Cu, Cd, Cr, Pb, Mn and Al in the cooking wine by HR-CS GFAAS with a minimum sample pre-treatment. The analyses of the six metal elements were conducted using a high resolution continuum source atomic absorption spectrometer. The cooking wine as sample was just diluted in ultrapure water with 1.0% (v/v) HNO3and the analytical lines of the six metal elements were selected scientifically. The correlation coefficients better than 0.99 were obtained and the limits of detection were 0.86, 0.08, 0.28, 0.81, 0.61 and 1.54 μg/L for Cu, Cd, Cr, Pb, Mn and Al, respectively. Recoveries varied form 96.1% to 105.7%. The proposed method was applied to the determination of the six metal elements in the cooking wine and the results showed that the mass concentrations of Cu, Cd, Cr, Pb, Mn and Al were 2.10, 0.177, 7.98, 1.86, 22.3 and 217.2 μg/L, respectively. There was a good agreement between the proposed method and the microwave digestion-HR-CS GFAAS method, and F-test and t-test at 95% of confidence had no significant difference. Therefore, the proposed method was accurate and stable with a high practical value. It provided scientific basis for quality control in food industries.

Comparison of Automated Method and Improved AOAC Kjeldahl Method for Determination of Protein in Meat and Meat Products

1981 ◽  
Vol 64 (1) ◽  
pp. 29-31 ◽  
Author(s):  
Debra L McGill
Keyword(s):  
Paired Comparison ◽  
Meat Products ◽  
Protein Determination ◽  
Automated Method ◽  
Significant Difference ◽  
Kjeldahl Method ◽  
Student’S T ◽  
Meat Samples ◽  
Student’S T Test

Abstract The Kjel-Foss automated method for protein determination in meat and meat products was compared with the improved AOAC Kjeldahl method. Meat samples were separated into 3 categories based on fat content and analyzed in duplicate by both methods. No significant difference was found in a paired comparison of the 2 methods in each of the 3 meat categories, using Student’s t-test at the 99% confidence level. A number of additional meat samples analyzed 6-9 times by the automated method showed an overall average range of 0.55% protein and average standard deviation of 0.20. The Kjel-Foss automated method was applicable for total protein determination in a wide variety of meat and meat products.

Development and Validation of a Method for Determining Elements in Solid Waste Using Microwave Digestion

1991 ◽  
Vol 74 (2) ◽  
pp. 360-366 ◽  
Author(s):  
David A Binstock ◽  
Peter M Grohse ◽  
Alvia Gaskill ◽  
Charles Sellers ◽  
H M Kingston ◽  
...  
Keyword(s):  
Solid Waste ◽  
Inductively Coupled Plasma ◽  
Microwave Digestion ◽  
Collaborative Study ◽  
Standard Reference Materials ◽  
Digestion Method ◽  
Inductively Coupled ◽  
Development And Validation ◽  
Microwave Assisted Method

Abstract A microwave-assisted method for preparing samples for determination of elements In solid waste has been developed (draft EPA Method 3051). Validation of the sample preparation method was performed through a collaborative study to determine its precision and accuracy. Fifteen independent laboratories digested 4 National Institute of Standards and Technology (NIST) standard reference materials (SRMs) and 1 solvent recovery waste in duplicate. Digestates were analyzed for 19 elements using inductively coupled plasma (ICP) emission spectroscopy. The precision and bias of the method were evaluated. When compared with an open vessel hot-plate digestion method (SW-846 Method 3050), the microwave method produced similar analytical results with better overall precision. Bias for the 1 sample that allowed this determination was found to be excellent.

scholarly journals Comparative analyses of water soaking and thickness swelling of particleboard versus different test methods

2008 ◽  
pp. 65-74
Author(s):  
Milanka Djiporovic-Momcilovic ◽  
Mladjan Popovic ◽  
Ivana Gavrilovic-Grmusa ◽  
Jovan Miljkovic
Keyword(s):  
Test Methods ◽  
National Standard ◽  
Thickness Swelling ◽  
European Standard ◽  
Test Pieces ◽  
Hygroscopic Properties ◽  
Significant Difference ◽  
High Level ◽  
Panel Thickness

In regard to its hygroscopic properties, particleboard is dimensionally unstable material when exposed to water or in the atmosphere of high level of humidity. Since today several different standardized methods for determination of thickness swelling exist, the aim of this study was focused on comparison of different testing methods. In this aim, three different methods for determination of water soaking and thickness swelling were compared, two of which were defined by national standard SRPS D.C8.104 and one was defined by European standard EN 317. The results of testing of both properties have shown no significant difference between the EN method based on 50?50 mm test pieces and the SRPS method based on test pieces of 100?100 mm format, suggesting that these two methods can be used alternatively. On the other hand, the results obtained by the SRPS method utilizing the 25?25 mm test pieces, differed significantly from both previous methods. The results were lower for both water soaking and thickness swelling regardless of panel thickness.

scholarly journals Determination of Metals in Composite Diet Samples by Inductively Coupled Plasma-Mass Spectrometry

2003 ◽  
Vol 86 (2) ◽  
pp. 439-448 ◽  
Author(s):  
Lisa Jo Melnyk ◽  
Jeffrey N Morgan ◽  
Reshan Fernando ◽  
Edo D Pellizzari ◽  
Olujide Akinbo
Keyword(s):  
Mass Spectrometry ◽  
Atmospheric Pressure ◽  
Inductively Coupled Plasma ◽  
Microwave Digestion ◽  
Standard Reference Materials ◽  
Inductively Coupled ◽  
Icp Ms ◽  
Relative Standard ◽  
Plasma Mass Spectrometry

Abstract A study was conducted to evaluate the applicability of inductively coupled plasma-mass spectrometry (ICP-MS) techniques for determination of metals in composite diets. Aluminum, cadmium, chromium, copper, lead, manganese, nickel, vanadium, and zinc were determined by this method. Atmospheric pressure microwave digestion was used to solubilize analytes in homogenized composite diet samples, and this procedure was followed by ICP-MS analysis. Recovery of certified elements from standard reference materials ranged from 92 to 119% with relative standard deviations (RSDs) of 0.4–1.9%. Recovery of elements from fortified composite diet samples ranged from 75 to 129% with RSDs of 0–11.3%. Limits of detection ranged from 1 to 1700 ng/g; high values were due to significant amounts of certain elements naturally present in composite diets. Results of this study demonstrate that low-resolution quadrupole-based ICP-MS provides precise and accurate measurements of the elements tested in composite diet samples.

Protein Analysis of Feeds, Using a Block Digestor

1975 ◽  
Vol 58 (1) ◽  
pp. 143-145 ◽  
Author(s):  
Larry G Hambleton ◽  
Rodney J Noel
Keyword(s):  
Cottonseed Meal ◽  
Soybean Meal ◽  
Blood Meal ◽  
Significant Difference ◽  
Kjeldahl Method ◽  
Student’S T ◽  
Feed Samples ◽  
Good Agreement ◽  
Student’S T Test

Abstract A method for the determination of proteins in feeds, utilizing the Technicon® BD-20 block digestor, has been developed. Twenty feed samples are weighed directly into the 250 ml tubes and digested for 35 min after clearing. The temperature of the solution during the digestion and the uniformity of temperature between various holes in the block were determined. The effect of air currents over the tubes was also studied. Six replicate determinations on cottonseed meal, blood meal, soybean meal, tryptophan, and 2 feed samples are reported and compared to results on the same sample analyzed by the official final action Kjeldahl method; good agreement was shown between the methods. The accuracy of the block digestor was confirmed by analyzing 40 routine feed samples by both the block digestor and Kjeldahl methods; results did not show a significant difference when compared by Student's t-test at the 5% level.

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