7.2.2 Laboratory Analysis

• What is laboratory analysis in the context of environmental science?

  Controlled experiments to analyze samples
• Laboratory analysis can measure properties not feasible in the field.

  True
• Gas chromatography separates and identifies volatile compounds
• What is the purpose of titration in laboratory analysis?

  Determine concentration
• Which type of microscope uses electron beams for higher magnification?

  Electron microscope
• UV-Vis spectrophotometers measure light in ultraviolet and visible ranges
• Steps involved in using gas chromatography to analyze a sample:

  1️⃣ Sample injection into the GC

  2️⃣ Separation of volatile compounds

  3️⃣ Detection using a detector

  4️⃣ Data analysis and identification
• Manual titration requires visual endpoint determination
• What is laboratory analysis in environmental science?

  Controlled experiments in a lab
• Laboratory analysis provides controlled conditions for reliable results in environmental science.

  True
• Spectrophotometry quantifies pollutant concentrations
• Which technique is used to separate and identify volatile compounds?

  Gas Chromatography
• Match the laboratory equipment with its purpose:

  Microscopes ↔️ Visualize microorganisms

  Spectrophotometers ↔️ Quantify pollutant concentrations

  Gas Chromatographs ↔️ Separate volatile compounds

  pH Meters ↔️ Measure acidity or alkalinity
• Microscopy allows for direct observation and identification of microorganisms in samples.

  True
• Filtration removes particulates from liquid samples
• What are common extraction methods used in sample preparation?

  Liquid-liquid, solid-phase, Soxhlet
• Filtration is used to remove particulates from liquid samples
• Filtration is a sample preparation method used to remove particulates and suspended solids
• Proper sample preparation ensures the integrity of the sample throughout the analysis process.


  True
• Digestion can break down samples using chemical or thermal methods.
• What type of storage is used in digital data management?

  Secure servers
• Laboratory analysis allows for precise and accurate determination of pollutant concentrations in environmental samples.


  True
• Match the laboratory analysis technique with its purpose:

  Spectrophotometry ↔️ Quantify pollutant concentrations

  Gas Chromatography ↔️ Separate volatile compounds

  Microscopy ↔️ Visualize microorganisms

  Titration ↔️ Determine substance concentration
• What is one property that laboratory analysis can measure but is not feasible in the field?

  Pollutant concentrations
• Laboratory analysis offers controlled conditions for reliable results
• What does spectrophotometry measure in laboratory analysis?

  Light absorption
• Microscopy is used in laboratory analysis to visualize microorganisms.


  True
• Light microscopes use visible light
• Fluorescence microscopes use fluorescent dyes to highlight specific structures.


  True
• What does an IR spectrophotometer measure?

  Infrared light absorption
• What does a pH meter measure?

  Acidity or alkalinity
• Match the equipment type with its purpose:

  Microscopes ↔️ Visualize microorganisms and cellular structures

  Spectrophotometers ↔️ Quantify pollutant concentrations

  Gas Chromatographs ↔️ Separate and identify volatile compounds

  pH Meters ↔️ Measure the acidity or alkalinity of liquids

  Titration Systems ↔️ Determine concentrations of substances
• Laboratory analysis allows for precise and accurate determination of pollutant concentrations
• What does spectrophotometry measure in laboratory analysis?

  Light absorption
• Gas chromatography separates volatile compounds in environmental samples.


  True
• Spectrophotometers measure light absorption
• What is the purpose of gas chromatography in environmental analysis?

  Separate volatile compounds
• What is a limitation of microscopy in laboratory analysis?

  Limited quantification
• Proper sample preparation minimizes interferences and ensures the integrity of environmental data.


  True
• Which sample preparation method isolates target analytes from complex matrices?

  Extraction