Liquid Sample Analysis
Liquid Sample Analysis - Related Videos
07:36
Analysis of Raw and Processed Cyperi Rhizoma Samples Using Liquid Chromatography-Tandem Mass Spectrometry in Rats with Primary Dysmenorrhea
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Cited by 6 •
2022
Here, a comparative analysis of raw and processed Cyperi rhizoma (CR) samples is presented using ultra-high performance liquid chromatography-high-resolution tandem mass spectrometry (UPLC-MS/MS) in rats with primary dysmenorrhea. The changes in blood levels of the metabolites and the sample constituents were examined between rats treated with CR and CR processed with vinegar (CRV).
09:21
Efficiency of Liquid-liquid Extraction
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2023
Source: Kerry M. Dooley and Michael G. Benton, Department of Chemical Engineering, Louisiana State University, Baton Rouge, LA Liquid-liquid extraction (LLE) is a separation technique used instead of distillation when either: (a) the relative volatilities of the compounds to be separated are very similar; (b) one or more of the mixture components are temperature sensitive even near ambient conditions; (c) the distillation would require a very low pressure or a very high distillate/feed...
10:16
Protocol for Microplastics Sampling on the Sea Surface and Sample Analysis
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Cited by 194 •
2016
The protocol below describes the methodology for: microplastics sampling on the sea surface, separation of microplastic and chemical identification of particles. This protocol is in line with the recommendations for microplastics monitoring published by the MSFD Technical Subgroup on Marine Litter.
10:41
Carbon and Nitrogen Analysis of Environmental Samples
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2023
Source: Laboratories of Margaret Workman and Kimberly Frye - Depaul University Elemental Analysis is a method used to determine elemental composition of a material. In environmental samples such as soils, scientists are particularly interested in the amounts of two ecologically important elements, nitrogen and carbon. Elemental analysis by the flash combustion technique works by oxidizing the sample with a catalyst through combustion in a high-temperature chamber. The products of combustion are...
05:26
A Standardized Liquid Biopsy Preanalytical Protocol for Downstream Circulating-Free DNA Applications
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Cited by 3 •
2022
The liquid biopsy has revolutionized our approach to oncology translational studies, with sample collection, quality, and storage being crucial steps for its successful clinical application. Here we describe a standardized and validated protocol for downstream circulating-free DNA applications that can be applied in most translational research laboratories.
FAQs
Preservation limits changes between collection and measurement, helping the sample retain the properties present at the sampling location. Preparation can remove interfering material or concentrate constituents that might otherwise be difficult to detect. Together, these steps improve the connection between the measured signal and the analyte concentration, making results more useful for environmental assessment.
These approaches provide different ways to examine constituents in a liquid sample. Spectroscopy, chromatography, and electrochemical tests generate analytical measurements that can be related to analyte concentrations. Selecting among them depends on the properties being characterized and the constituents of interest, such as nutrients, pollutants, dissolved metals, or other indicators of contamination.
Controlled collection conditions help ensure that measurements represent the sampled water or liquid rather than changes introduced during handling. Because samples may be altered after collection, consistent collection and preservation are important for comparing results across locations or times. This supports more reliable evaluation of contamination, ecosystem conditions, and changes associated with treatment or remediation.
An instrument produces a measurable signal from the prepared liquid sample, and that signal is related to the concentration of a target analyte. The relationship allows researchers to estimate the amount of a constituent such as a nutrient, pollutant, or dissolved metal. Sample preparation is important because removing or concentrating constituents can affect how clearly the signal reflects the analyte.
A typical workflow begins with controlled sample collection, followed by preservation to limit unwanted changes. The sample is then prepared, potentially by removing material or concentrating constituents, before an analytical measurement is performed. Researchers interpret the resulting instrument signal in relation to analyte concentration, creating data that can support water-quality and environmental assessments.
Researchers apply these analyses when they need evidence about water quality, contamination, or ecosystem conditions. Measurements can identify nutrients, pollutants, dissolved metals, and other contamination indicators. Comparing results among samples can also help trace pollutant sources and evaluate whether treatment or remediation has reduced the constituents of concern.