Low-sulphate water sample preparation for LSC detection of 35S avoiding sulphate precipitation

2020 ◽  
Vol 213 ◽  
pp. 106153 ◽  
Author(s):  
M. Schubert ◽  
J. Kopitz ◽  
K. Knöller
Keyword(s):  
Sample Preparation ◽  
Water Sample ◽  
Water Sample Preparation ◽  
Sulphate Water

scholarly journals Gas Chromatography–Mass Spectrometry Quantification of 1,1-Dimethylhydrazine Transformation Products in Aqueous Solutions: Accelerated Water Sample Preparation

Molecules ◽  
2021 ◽  
Vol 26 (19) ◽  
pp. 5743
Author(s):  
Mark S. Popov ◽  
Nikolay V. Ul’yanovskii ◽  
Dmitry S. Kosyakov
Keyword(s):  
Mass Spectrometry ◽  
Gas Chromatography ◽  
Sample Preparation ◽  
Aqueous Solutions ◽  
Water Sample ◽  
Transformation Products ◽  
Gas Chromatography Mass Spectrometry ◽  
Rocket Fuel ◽  
Chromatography Mass Spectrometry ◽  
Water Sample Preparation

The use of highly toxic rocket fuel based on 1,1-dimethylhydrazine (UDMH) in many types of carrier rockets poses a threat to environment and human health associated with an ingress of UDMH into wastewater and natural reservoirs and its transformation with the formation of numerous toxic nitrogen-containing products. Their GC-MS quantification in aqueous samples requires matrix change and is challenging due to high polarity of analytes. To overcome this problem, accelerated water sample preparation (AWASP) based on the complete removal of water with anhydrous sodium sulfate and transferring analytes into dichloromethane was used. Twenty-nine UDMH transformation products including both the acyclic and heterocyclic compounds of various classes were chosen as target analytes. AWASP ensured attaining near quantitative extraction of 23 compounds with sample preparation procedure duration of no more than 5 min. Combination of AWASP with gas chromatography–mass spectrometry and using pyridine-d5 as an internal standard allowed for developing the rapid, simple, and low-cost method for simultaneous quantification of UDMH transformation products with detection limits of 1–5 μg L−1 and linear concentration range covering 4 orders of magnitude. The method has been validated and successfully tested in the analysis of aqueous solutions of rocket fuel subjected to oxidation with atmospheric oxygen, as well as pyrolytic gasification in supercritical water modelling wastewater from carrier rockets launch sites.

ESTABLISHING WATER SAMPLE PROTOCOLS FOR RADIOCARBON ANALYSIS AT LAC-UFF, BRAZIL

Radiocarbon ◽  
2021 ◽  
pp. 1-8
Author(s):  
Daniela Bragança ◽  
Fabiana Oliveira ◽  
Kita Macario ◽  
Vinicius Nunes ◽  
Marcelo Muniz ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Latin America ◽  
Sample Preparation ◽  
Water Sample ◽  
Accelerator Mass Spectrometry ◽  
Surface Seawater ◽  
Environmental Matrices ◽  
Preliminary Results ◽  
Mass Spectrometry Facility ◽  
Validation Tests

ABSTRACT Since the establishment of the first radiocarbon accelerator mass spectrometry facility in Latin America in 2009, the Radiocarbon Laboratory team of Universidade Federal Fluminense (LAC-UFF) has worked to improve sample preparation protocols and increase the range of environmental matrices to be analyzed. We now present the preliminary results for DIC sample preparation protocols. The first validation tests include background evaluation with pMC value (0.35 ± 0.04) using bicarbonate dissolved in water. We also analyzed surface seawater resulting in pMC value (101.38 ± 0.38) and a groundwater previously dated from LEMA AMS-Laboratory with pMC value (12.30 ± 0.15).

Proton Induced X-Ray Fluorescence Analysis Using a Cockcroft-Walton Accelerator

1974 ◽  
Vol 18 ◽  
pp. 299-308
Author(s):  
D. I. Bales ◽  
R. R. Landolt ◽  
W. E. Toll
Keyword(s):  
High Resolution ◽  
Sample Preparation ◽  
Water Sample ◽  
Cross Sections ◽  
Proton Energy ◽  
Fluorescence Analysis ◽  
X Rays ◽  
X Ray ◽  
Beam Currents ◽  
Better Than

AbstractThe production of characteristic x rays by 100-keV protons has been studied to determine the feasibility of using a Cockcroft- Walton accelerator as an excitation source for x ray fluorescence analysis. Because of the low cross sections at this proton energy, it was necessary to concentrate on characteristic x rays below 6 keV and to use beam currents of 10 to 100 μA. The x rays were measured by a high resolution Si(Li) detector.The preparation of various types of samples and the problems that arise when working at low proton energies and high beam currents are discussed.It was found that the technique is useful for low atomic number elements down to less than 1 ppm in a water sample when there are no other significant impurities. When other elements are present, however, proton absorption becomes an important factor and quantitative determinations become very difficult. Proton absorption and its effect upon the usefulness of the technique are discussed.The precision for the technique was determined and found to be better than 20% for most measurements. This includes errors in sample preparation which was considered to be a significant portion of the uncertainty.

scholarly journals Penggunaan Gel Lidah Buaya (Aloe vera) Sebagai Koagulan Alami Dalam Penjernihan Air Sumur Di Desa Sausu Tambu Kecamatan Sausu

2017 ◽  
Vol 5 (1) ◽  
pp. 16
Author(s):  
Mujariah Mujariah ◽  
Paulus Hengky Abram ◽  
Minarni Rama Jura
Keyword(s):  
Water Sample ◽  
Aloe Vera ◽  
Quality Parameters ◽  
Optimum Ratio ◽  
Natural Coagulant ◽  
Natural Production ◽  
Water Wells ◽  
Aloe Vera Gel ◽  
Water Sample Preparation ◽  
The Village

Research on the use of aloe vera gel (aloe vera) as a natural coagulant in water purification village wells Sausu Tambu has been done. This study aims to determine whether aloe vera gel can be used as a natural coagulant and determine the optimum ratio of aloe vera gel in water (V/V) which is used in the purification of water wells in the village Sausu Tambu. Research was conducted on the water sample preparation, natural production of aloe vera gel, water treatment and analysis of water quality parameters, namely turbidity, hardness, color, pH and temperature. The results showed that aloe vera gel can be used as a coagulant to purify the water with an optimum ratio of 0.3 mL aloe vera gel in 500 mL water sample. Aloe vera gel can reduce 72.22% of turbidity, 63.48% hardness, 68.62% color with a pH of 5.5 and a temperature of 30 oC. It can be concluded that the aloe vera gel has the ability as a coagulant to purify water.

Pollutant Identification by Selected Area Electron Diffraction

1974 ◽  
Vol 32 ◽  
pp. 532-533
Author(s):  
R. E. Ferrell ◽  
G. G. Paulson ◽  
C. W. Walker
Keyword(s):  
Thermal Treatment ◽  
Electron Diffraction ◽  
Sample Preparation ◽  
Crystal Structures ◽  
Water Samples ◽  
Environmental Samples ◽  
Short Review ◽  
Selected Area Electron Diffraction ◽  
Multiple Component

Selected area electron diffraction (SAD) has been used successfully to determine crystal structures, identify traces of minerals in rocks, and characterize the phases formed during thermal treatment of micron-sized particles. There is an increased interest in the method because it has the potential capability of identifying micron-sized pollutants in air and water samples. This paper is a short review of the theory behind SAD and a discussion of the sample preparation employed for the analysis of multiple component environmental samples.

Preparation of Thin Cadmium Telluride Samples for Electron Microscope Studies

1974 ◽  
Vol 32 ◽  
pp. 548-549
Author(s):  
T. J. Magee ◽  
J. Peng ◽  
J. Bean
Keyword(s):  
Electron Microscope ◽  
Sulfuric Acid ◽  
Solid State ◽  
Sample Preparation ◽  
Cadmium Telluride ◽  
Potassium Dichromate ◽  
Optical Components ◽  
The Past ◽  
Solid State Devices

Cadmium telluride has become increasingly important in a number of technological applications, particularly in the area of laser-optical components and solid state devices, Microstructural characterizations of the material have in the past been somewhat limited because of the lack of suitable sample preparation and thinning techniques. Utilizing a modified jet thinning apparatus and a potassium dichromate-sulfuric acid thinning solution, a procedure has now been developed for obtaining thin contamination-free samples for TEM examination.

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