scholarly journals Sample Preparation Using TMAH and Nitric Acid for Multielement Determination in Crustacean Samples by MIP OES

2021 ◽  
Author(s):  
Michelle Lemos ◽  
Allan Cruz ◽  
Kelly Dantas
Keyword(s):  
Nitric Acid ◽  
Sample Preparation ◽  
Multielement Determination ◽  
Mip Oes

Use of Microwave Oven and Nitric Acid-Hydrogen Peroxide Digestion to Prepare Botanical Materials for Elemental Analysis by Inductively Coupled Argon Plasma Emission Spectroscopy

1985 ◽  
Vol 68 (4) ◽  
pp. 766-769
Author(s):  
Thomas R White ◽  
Garnett E Douthit
Keyword(s):  
Hydrogen Peroxide ◽  
Nitric Acid ◽  
Sample Preparation ◽  
Emission Spectroscopy ◽  
Argon Plasma ◽  
Microwave Oven ◽  
Standard Reference Materials ◽  
Plasma Emission ◽  
Inductively Coupled ◽  
Plasma Emission Spectroscopy

Abstract A sample preparation method has been developed that provides a nitric acid-hydrogen peroxide digestion of plant tissue when it is heated internally by the oscillating electromagnetic field generated in a microwave oven. The total elemental concentration for barium, calcium, magnesium, manganese, phosphorus, potassium, sodium, sulfur, and zinc can be determined by inductively coupled argon plasma emission spectroscopy after sample preparation in a microwave oven. The method is rapid and provides quantitative results that agree with certified values for 4 National Bureau of Standards Standard Reference Materials: 1570 Spinach, 1572 Citrus Leaves, 1573 Tomato Leaves, and 1575 Pine Needles.

Development of an Eco-friendly Sample Preparation protocol for metals determination in food samples: Oxygen Pressurized Single Reaction Chamber using Diluted Nitric Acid

2021 ◽  
Author(s):  
Cezar Augusto Bizzi ◽  
Matheus Felipe Pedrotti ◽  
Diogo Maurício Betiolo ◽  
Mariele Samuel Nascimento ◽  
Edson Irineu Müller ◽  
...  
Keyword(s):  
Nitric Acid ◽  
Sample Preparation ◽  
Reaction Chamber ◽  
Food Samples ◽  
Alternative Method ◽  
Digestion Efficiency ◽  
Single Reaction

Many efforts have been recently made to improve the digestion efficiency by using powerful equipment or by using auxiliary reagent. In this work, an alternative method is reported, which explores...

scholarly journals Development of a sample preparation procedure for Sr isotope analysis of Portland cements

2022 ◽  
Author(s):  
Anera Kazlagić ◽  
Francesco F. Russo ◽  
Jochen Vogl ◽  
Patrick Sturm ◽  
Dietmar Stephan ◽  
...  
Keyword(s):  
Nitric Acid ◽  
Hydrochloric Acid ◽  
Sample Preparation ◽  
Isotope Ratio ◽  
Isotope Ratios ◽  
Preparation Procedure ◽  
Sr Isotope ◽  
Portland Cements ◽  
Sr Isotope Ratio ◽  
Sample Preparation Procedure

AbstractThe 87Sr/86Sr isotope ratio can, in principle, be used for provenancing of cement. However, while commercial cements consist of multiple components, no detailed investigation into their individual 87Sr/86Sr isotope ratios or their influence on the integral 87Sr/86Sr isotope ratio of the resulting cement was conducted previously. Therefore, the present study aimed at determining and comparing the conventional 87Sr/86Sr isotope ratios of a diverse set of Portland cements and their corresponding Portland clinkers, the major component of these cements. Two approaches to remove the additives from the cements, i.e. to measure the conventional 87Sr/86Sr isotopic fingerprint of the clinker only, were tested, namely, treatment with a potassium hydroxide/sucrose solution and sieving on a 11-µm sieve. Dissolution in concentrated hydrochloric acid/nitric acid and in diluted nitric acid was employed to determine the 87Sr/86Sr isotope ratios of the cements and the individual clinkers. The aim was to find the most appropriate sample preparation procedure for cement provenancing, and the selection was realised by comparing the 87Sr/86Sr isotope ratios of differently treated cements with those of the corresponding clinkers. None of the methods to separate the clinkers from the cements proved to be satisfactory. However, it was found that the 87Sr/86Sr isotope ratios of clinker and cement generally corresponded, meaning that the latter can be used as a proxy for the clinker 87Sr/86Sr isotope ratio. Finally, the concentrated hydrochloric acid/nitric acid dissolution method was found to be the most suitable sample preparation method for the cements; it is thus recommended for 87Sr/86Sr isotope analyses for cement provenancing. Graphical abstract

scholarly journals Comparative Study of Sample-Preparation Techniques for Quantitative Analysis of the Mineral Composition of Humic Substances by Inductively Coupled Plasma Atomic Emission Spectroscopy

Agronomy ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 2453
Author(s):  
Evgeniya A. Karpukhina ◽  
Elena A. Vlasova ◽  
Dmitry S. Volkov ◽  
Mikhail A. Proskurnin
Keyword(s):  
Nitric Acid ◽  
Sample Preparation ◽  
Humic Substances ◽  
Mineral Composition ◽  
Inductively Coupled Plasma ◽  
Bulk Composition ◽  
Organic Matrix ◽  
Direct Analysis ◽  
Water Soluble ◽  
Preparation Techniques

Five sample-preparation techniques were compared to quantify 31 elements in coal humic substances (HS) by ICP–AES from the viewpoints of complete isolation and speciation of elements. They include, for bulk composition, preparation of an aqueous colloidal HS solution followed by direct injection of the sample without decomposition and ashing followed by metaborate fusion; for element speciation, preparation of an aqueous colloidal HS solution followed by centrifugation and direct analysis without decomposition for water-soluble species; treatment with boiling nitric acid; and microwave-assisted treatment with nitric acid at 250 °C for acid-isolated species. The results of analysis significantly depend on the selected method of sample preparation due to specific features of HS, the simultaneous presence of many inorganic components in wide concentration ranges, and a significant fraction of the organic matrix; therefore, the total mineral composition of HS, both macro- and microcomponents, requires a combination of decomposition methods.

scholarly journals Ecofriendly and low-cost sample preparation methods for magnesium determination in beer

2021 ◽  
Vol 46 (3) ◽  
pp. 33-41
Author(s):  
Thalles Pedrosa Lisboa ◽  
Luiza Conforte da Silva Lemos ◽  
Fillipe Caitano Calzavara ◽  
Beatriz Silva Barbosa ◽  
Gabriela Ezura Baia ◽  
...  
Keyword(s):  
Nitric Acid ◽  
Sample Preparation ◽  
Acid Solution ◽  
Nitric Acid Solution ◽  
Direct Analysis ◽  
Good Precision ◽  
Preparation Methods ◽  
Relative Standard ◽  
Total Digestion ◽  
Sample Preparation Methods

Ultrasound-assisted extraction and direct analysis were compared with total digestion for magnesium determination in beer samples by flame atomic absorption spectrometry. The method for total digestion used concentrated nitric acid under plate heating. In optimized instrumental conditions, validation of the analytical method was promoted, with good linear range (0.06 to 0.5 mg L�1), low limits of detection and quantification (0.04 and 0.12 �g g�1, respectively), good precision, relative standard deviation (RSD) less than 3.4%, and accuracy (recovery levels of 91.5 to 99.0%). The characteristic concentration (C0) was 9 �g L�1. The extraction procedure was performed in a 1:1 nitric acid solution for 55 min in an ultrasonic bath at 60 �C, while the direct analysis involved a dilution of the samples in a 2% v/v nitric acid solution. The different sample preparation methods were applied to 13 beer samples and at a 95% confidence level, no significant differences were observed. Thus, direct analysis proved to be more suitable for quality control routines of beer samples in the industry.

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