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Related Concept Videos

Sampling Methods: Sample Types01:18

Sampling Methods: Sample Types

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Sampling materials are classified into three main types: solid, liquid, and gas.
Solid samples include a variety of substances, such as sediments from water bodies, soil, metals, and biological tissues. Two standard methods for extracting sediments from water bodies are grab sampling and piston coring. Grab sampling involves using a device to collect a discrete sediment sample from the bottom of a water body with minimal disturbance. Grab samples do not always represent the entire area due to...
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Sampling Plans01:23

Sampling Plans

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Sampling is a crucial step in analytical chemistry, allowing researchers to collect representative data from a large population. Common sampling methods include random, judgmental, systematic, stratified, and cluster sampling.
Random sampling is a method where each member of the population has an equal chance of being selected for the sample. It involves selecting individuals randomly, often using random number generators or lottery-type methods. For example, when analyzing the properties of a...
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Sampling Methods: Overview01:06

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A sample refers to a smaller subset representative of a larger population. In analytical chemistry, studying or analyzing an entire population is often impractical or impossible. Therefore, samples are used to draw inferences and generalize the whole population. The sampling method selects individuals or items from a population to create a sample. Standard sampling methods include random, judgemental, systematic, stratified, and cluster sampling. 
In analytical chemistry, the choice of...
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Convenience Sampling Method00:55

Convenience Sampling Method

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Sampling is a technique to select a portion (or subset) of the larger population and study that portion (the sample) to gain information about the population. Data are the result of sampling from a population. The sampling method ensures that samples are drawn without bias and accurately represent the population.
Convenience sampling is a non-random method of sample selection; this method selects individuals that are easily accessible and may result in biased data. For example, a marketing...
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Quality of Water01:19

Quality of Water

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In concrete preparation, the quality of water is paramount as it affects the strength and durability of the concrete. Potable water is usually preferred; however, it must not have excessive sodium or potassium to prevent compromising the concrete's integrity. Water quality is typically evaluated based on impurities such as dissolved solids, chlorides, and sulfates, and its pH value is ideally between 6 and 8. Even slightly acidic natural water may be acceptable unless it contains harmful...
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Contaminants and Errors01:16

Contaminants and Errors

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Effective sample preparation is crucial for accurate and reliable laboratory analysis. During this process, two significant sources of error can arise: concentration bias from improper sample splitting and contamination caused by methods used to reduce particle size, such as grinding or homogenization. Identifying and minimizing these potential errors is crucial to ensuring the validity of the analysis.
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Continuous Instream Monitoring of Nutrients and Sediment in Agricultural Watersheds
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Considerations in sampling of water.

Charles A Ramsey

    Journal of AOAC International
    |March 26, 2015
    PubMed
    Summary

    This study applies the Theory of Sampling to water, emphasizing material properties like temporal dynamics and suspended solids. Developing robust water sampling protocols requires understanding these unique characteristics for accurate sample quality.

    Area of Science:

    • Environmental Science
    • Analytical Chemistry
    • Sampling Theory

    Background:

    • Water sampling shares fundamental principles with sampling other media, relying on Sample Quality Criteria and material property understanding.
    • The unique material properties of water, unlike solids, necessitate specific considerations in sampling protocols.
    • Temporal dynamics and the presence of suspended solids are critical properties influencing water sample integrity.

    Purpose of the Study:

    • To highlight the key material properties of water that differentiate it from solid media in sampling.
    • To demonstrate how understanding these properties informs the development of effective water sampling protocols.
    • To provide practical examples for specific water sampling scenarios.

    Main Methods:

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  • Application of the fundamental principles of the Theory of Sampling.
  • Analysis of water's material properties, focusing on temporal aspects and suspended solids.
  • Development and illustration of sampling protocols based on identified properties.

    • Main Results:

    • Established that water sampling protocols must account for its temporal nature.
    • Demonstrated the importance of addressing suspended solids in water samples.
    • Presented three case studies illustrating the application of developed sampling protocols.

    Conclusions:

    • Effective water sampling requires a tailored approach based on its unique material properties.
    • The Theory of Sampling provides a robust framework for developing accurate water sampling protocols.
    • The presented methodologies and examples offer guidance for various water sampling applications.