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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.
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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. 
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Characterization and Application of Passive Samplers for Monitoring of Pesticides in Water
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Passive sampling methods for contaminated sediments: practical guidance for selection, calibration, and

Upal Ghosh1, Susan Kane Driscoll, Robert M Burgess

  • 1Department of Chemical, Biochemical, and Environmental Engineering, University of Maryland Baltimore County, Baltimore, Maryland, USA.

Integrated Environmental Assessment and Management
|November 30, 2013
PubMed
Summary
This summary is machine-generated.

Passive sampling methods (PSMs) offer improved exposure assessment for hydrophobic organic chemicals in sediments by measuring freely dissolved concentrations (Cfree). This guidance aids in selecting, calibrating, and validating PSMs for accurate risk assessment.

Keywords:
BioavailabilityContaminated sedimentEquilibrium partitioningPassive sampling methodsPorewater

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Area of Science:

  • Environmental Chemistry
  • Ecotoxicology
  • Analytical Chemistry

Background:

  • Assessing exposure to hydrophobic organic chemicals (HOCs) in sediments is crucial for environmental risk assessment.
  • Traditional methods often struggle to accurately represent the bioavailable fraction of HOCs.
  • Freely dissolved concentration (Cfree) is a key metric for predicting toxicity and bioavailability.

Framework:

  • Passive Sampling Methods (PSMs) are introduced as a tool to measure Cfree.
  • Selection criteria for PSMs are based on measurement goals (Cfree), application type (ex situ/in situ), and suitability.
  • Guidelines for PSM calibration and validation are provided, including polymer-water partition coefficients and equilibrium determination.

Implementation:

  • Calibration involves using provisional polymer-water partition coefficients.
  • Validation requires confirming equilibrium status and non-depletive measurement conditions.
  • A hypothetical example demonstrates reduced uncertainty in toxicity assessment using Cfree.

Implications:

  • Accurate Cfree measurements using PSMs enhance sediment exposure assessment.
  • Improved data supports more robust risk assessment and contaminated sediment management decisions.
  • Future research will further refine PSM robustness for Cfree quantification.