Performance assessment of a cavity ring-down laser spectrometer: achieving better precision and accuracy in the measurement of δ18O and δ2H in liquid water samples

2013 ◽  
Vol 25 (1) ◽  
pp. 015801 ◽  
Author(s):  
A J Prado-Pérez ◽  
J Rodríguez-Arévalo ◽  
M F Díaz-Teijeiro
Keyword(s):  
Performance Assessment ◽  
Liquid Water ◽  
Water Samples ◽  
Laser Spectrometer ◽  
Precision And Accuracy ◽  
Cavity Ring Down

scholarly journals Spatial and seasonal patterns of water isotopes in northeastern German lakes

2021 ◽  
Author(s):  
Bernhard Aichner ◽  
David Dubbert ◽  
Christine Kiel ◽  
Katrin Kohnert ◽  
Igor Ogashawara ◽  
...  
Keyword(s):  
Water Samples ◽  
Water Surface ◽  
Isotope Analysis ◽  
Water Isotopes ◽  
Seasonal Patterns ◽  
Water Sampler ◽  
Spatially Distributed ◽  
Northeastern Germany ◽  
Riverine Systems ◽  
Cavity Ring Down

Abstract. Water isotopes (δ2H and δ18O) were analyzed in samples collected in lakes associated to riverine systems in northeastern Germany throughout 2020. The dataset (Aichner et al., 2021) is derived from water samples collected at a) lake shores (sampled in March and July 2020); b) buoys which were temporarily installed in deep parts of the lake (sampled monthly from March to October 2020); c) multiple spatially distributed spots in four selected lakes (sampled in September 2020); d) the outflow of Müggelsee (sampled biweekly from March 2020 to January 2021). At shores, water was sampled with a pipette from 40–60 cm below water surface and directly transferred into a measurement vial, while at deeper parts of the lake a Limnos water sampler was used to obtain samples from 1 m below surface. Isotope analysis was conducted at IGB Berlin, using a Picarro L2130-i cavity ring-down spectrometer. The data give information about the seasonal isotope amplitude in the sampled lakes and about spatial isotope patterns in different branches of the associated riverine systems.

A Standard Method for Quantification of Earthy-Musty Odorants in Water, Sediments, and Algal Cultures

1983 ◽  
Vol 15 (6-7) ◽  
pp. 127-138 ◽  
Author(s):  
S W Krasner ◽  
C J Hwang ◽  
M J McGuire
Keyword(s):  
Mass Spectrometry ◽  
Gas Chromatography ◽  
Standard Method ◽  
Water Samples ◽  
Closed Loop ◽  
Gas Chromatography Mass Spectrometry ◽  
Taste And Odor ◽  
Precision And Accuracy ◽  
Algal Cultures

The closed-loop stripping analysis (CLSA) method of Grob, in combination with gas chromatography/mass spectrometry (GC/MS), has been used in the determination of five earthy-musty-smelling compounds (including geosmin and 2-methylisoborneol). One-liter water samples are analyzed within 3 hours, with detection limits as low as 2 ng/l each. Precision and accuracy levels of 20 percent or better are obtainable with this method. This technique has been modified to include the CLSA of sediments and laboratory-grown microbiological cultures in order to investigate the sources of the odorous compounds. CLSA-GC/MS provides a valuable tool for extended surveys and regular monitoring of water supplies, and it is indispensable in the understanding and management of earthy-musty taste and odor problems.

scholarly journals Studi Interaksi Air Tanah Dangkal dan Air Sungai di Sepanjang Daerah Aliran Kali Garang Semarang Menggunakan Isotop Stabil δ18O dan δ2H

EKSPLORIUM ◽  
2017 ◽  
Vol 38 (1) ◽  
pp. 43
Author(s):  
Rismah Taufik Andhihutomo ◽  
Satrio Satrio ◽  
Rasi Prasetio ◽  
Agus Budhie Wijatna
Keyword(s):  
Stable Isotopes ◽  
River Water ◽  
Liquid Water ◽  
Water Samples ◽  
Shallow Groundwater ◽  
River Water Samples ◽  
Central Java ◽  
Groundwater Samples ◽  
Water Recharge ◽  
Water Isotope

ABSTRAKPenelitian mengenai interaksi airtanah dangkal dengan air sungai Kali Garang di Semarang, Jawa Tengah, menggunakan parameter isotop 18O dan 2H telah dilakukan. Sebanyak 16 sampel air tanah dangkal dan 3 sampel air sungai diambil untuk analisis kandungan isotop stabil d18O dan d2H menggunakan alat Liquid Water Isotope Analyzer LGR DLT-100. Hasil analisis memperlihatkan adanya dua asal daerah masukan air: daerah pertama memiliki kandungan isotop d18O antara -9,41 ‰ hingga-8,5 ‰ dan d2H antara -58,2 ‰ hingga -51,6 ‰; daerah kedua memiliki kandungan isotop d18O dan d2H masing-masing -7,15 ‰ dan -41,55 ‰. Dengan demikian, hasil tersebut mengindikasikan bahwa sampel-sampel air pertama berasal dari elevasi yang relatif lebih tinggi jika dibandingkan dengan asal sampel air kedua, namun keduanya tidak mengalami interaksi dengan air sungai. Sedangkan sampel air tanah lainnya menunjukkan bahwa satu sampel (R4) memiliki interelasi berupa pencampuran dengan air sungai dan dua sampel lainnya (L1 dan R1) mengalami pencampuran dengan air asin atau air laut. ABSTRACTA study related to shallow groundwater interaction with Kali Garang River water in Semarang, Central Java using stable isotopes of 18O and 2H has been conducted. As much as 16 groundwater and 3 river water samples were taken for stable isotopes d18O and d2H analysis using Liquid water isotope analyzer LGR DLT-100. The results of analysis shows that there are two area of water recharge origin: the first area contains d18O isotope ranging between -9.41 ‰ to -8.5 ‰ and d2H between -58.2 ‰ to -51.6 ‰; the second area contains isotopes of d18O and d2H -7.15 and -41.55 ‰, respectively. Thus, these results indicate that the first water samples originate from a higher elevation than the origin of the second water sample, but both of them have no interrelation with river water. Whereas, other groundwater samples show that the sample (R4) has interrelation (i.e. mixing) with the river water and two other samples (L1 and R1) have interrelation with salty water or seawater.

Measurement of 2H2O by IR absorbance in doubly labeled H2O studies of energy expenditure

1988 ◽  
Vol 255 (1) ◽  
pp. R174-R177 ◽  
Author(s):  
W. H. Karasov ◽  
L. R. Han ◽  
J. C. Munger
Keyword(s):  
Energy Expenditure ◽  
Linear Relationship ◽  
Water Samples ◽  
Body Water ◽  
Doubly Labeled Water ◽  
Infrared Spectrophotometry ◽  
Turnover Rates ◽  
Precision And Accuracy ◽  
Fractionation Factors

The energy expenditure of animals in their natural surroundings can be determined by measuring the turnover in body water of isotopes of oxygen and hydrogen. We evaluated the use of infrared spectrophotometry for measuring 2H2O in small (20-microliters) water samples also labeled with 18O. For 2H2O over the enrichment range of 0.1-1 atom%, there was a linear relationship between infrared absorbance and 2H2O enrichment. 2H2O enrichments could be measured with a precision and accuracy of less than or equal to 1%, using this relationship. The presence of 18O in water samples in enrichments of up to 1 atom% had no significant effect on measurement of 2H2O by infrared absorbance. We measured the simultaneous turnover rates of 2H2O and 3H in mice and turtles also labeled with 18O. Our results validated the use of infrared absorbance in doubly labeled water measures of energy expenditure and indicated that the fractionation factors in vivo for 2H2O and 3H do not differ.

scholarly journals Assessment of Sr-90 in water samples: precision and accuracy

2019 ◽  
Vol 7 (2A) ◽  
Author(s):  
Marcelo Bessa Nisti ◽  
Cátia H.R. Saueia ◽  
Bruna Castilho ◽  
Barbara P. Mazzilli
Keyword(s):  
Power Plant ◽  
Nuclear Power Plant ◽  
Water Samples ◽  
Nuclear Power ◽  
Direct Method ◽  
Nuclear Fission ◽  
Nuclear Weapons Testing ◽  
Liquid Discharge ◽  
Precision And Accuracy

The study of artificial radionuclides dispersion into the environment is very important to control the nuclear waste discharges, nuclear accidents and nuclear weapons testing. The accidents in Fukushima Daiichi Nuclear Power Plant and Chernobyl Nuclear Power Plant, released several radionuclides in the environment by aerial deposition and liquid discharge, with various level of radioactivity. The 90Sr was one of the elements released into the environment. The 90Sr is produced by nuclear fission with a physical half-life of 28.79 years with decay    energy of 0.546 MeV. The aims of this study are to evaluate the precision and accuracy of three methodologies for the determination of 90Sr in water samples: Cerenkov, LSC direct method and with radiochemical            separation. The performance of the methodologies was evaluated by using two scintillation counters (Quantulus and Hidex). The parameters Minimum Detectable Activity (MDA) and Figure Of Merit (FOM) were determined for each method, the precision and accuracy were checked using 90Sr standard solutions. 

scholarly journals Analytical validation of LAL kinetic assay for detection and quantification of endotoxins in measles's vaccine diluents

2006 ◽  
Vol 49 (spe) ◽  
pp. 59-64
Author(s):  
Rosane Cuber Guimarães ◽  
Alaide Aline Xavier Leal
Keyword(s):  
Method Validation ◽  
Water Samples ◽  
Analytical Validation ◽  
Kinetic Assay ◽  
Intermediate Precision ◽  
Specific Test ◽  
Validation Parameters ◽  
Precision And Accuracy ◽  
Intended Use ◽  
Detection And Quantification

Method validation is the process used to confirm that the analytical procedures employed for a specific test is able to produce reliable and replicable results. An analytical method should be conducted in order to demonstrate that it is suitable for its intended use [1]. The aim of this present work is to demonstrate and evaluate the suitability of method validation. The analytical validation discussed herein was conducted by prescribed protocol, using 3 different batches of measles's vaccine diluents. All of the stipulated validation parameters: linearity, repeatability, reproducibility (intermediate precision) and accuracy were met. Additionally, this study demonstrated the method's capability for the determining endotoxin levels in measles's vaccine diluents and its further use in apirogenic water samples.

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