18 Questions
In which biological and biochemical analysis does AAS play a significant role?
Determination of trace metals in silicon foam cavity wound dressing, zinc in Zinc insulin suspension, and other biological samples.
What is the main application of Atomic Absorption Spectroscopy (AAS) in environmental studies?
Determination of small amounts of metals in ocean water and soil.
What is the role of AAS in pharmaceutical analysis?
Analysis of pharmaceutically or therapeutically essential components, such as zinc in Zinc-insulin, and detection of metal impurities.
In which industrial applications is AAS commonly used?
Mining, petroleum, and food industries, including determination of metallic elements in vegetable oil and beer.
What is the importance of AAS in food industry analysis?
Determination of metallic elements, such as copper, zinc, and nickel, in food products, such as vegetable oil and beer.
What is the significance of AAS in determining the purity and consistency of trace metals?
AAS is used to detect and quantify trace metals in solid samples, such as minerals, ores, and alloys.
What are the types of solvents used in sample preparation?
Aliphatic ketones, aliphatic esters, alcohols, xylene, cyclohexanes, and isopropanol are examples of solvents used.
How are inorganic solid samples prepared for analysis?
Inorganic solid samples are solvated using appropriate aqueous or acid medium, such as hot water, concentrated acids, or acidic mixtures, depending on solubility.
What is the requirement before solubilizing organic solid samples?
Destruction of the sample via wet digestion or ashing in a furnace (muffle) is required before solubilization.
How can gases be analyzed using atomic absorption spectroscopy?
Gases can be analyzed indirectly by converting them into a liquid sample, which can then be analyzed using atomic absorption spectroscopy.
What is the effect of interference on the analytical signal?
Interference can cause an increase or decrease in the size of the signal obtained from the analyte, due to the presence of other known or unknown components in the sample.
What types of samples are commonly encountered in biological analysis?
Samples commonly encountered in biological analysis include tissues, biological solids, and food materials.
In biological analysis, what type of samples require minimal preparation for AAS?
Aqueous solutions, such as biological fluids, including blood, urine, and plasma.
What is the primary consideration when preparing organic liquid samples for AAS?
They can be directly aspirated.
In pharmaceutical analysis, what is the importance of considering the path length in AAS?
To ensure the absorbance is within the optimum working range.
Why is sample dilution an alternative to consider when dealing with high concentrations of analytes in environmental analysis?
To bring the absorbance into the optimum working range.
What is the purpose of preparing a range of standards, including a blank, in AAS for food industry analysis?
To have sufficient information to fit the standard curve appropriately.
What is the consequence of deviations from linearity in AAS, especially at high concentrations of metallic analytes?
Unabsorbed radiation, stray light, or disproportionate decomposition of molecules.
Study Notes
Types of Interference
- Spectral interference
- Chemical interference
- Ionization interference
Atomic Absorption Spectroscopy (AAS) Applications
- Determination of small amounts of metals (Pb, Hg, Ca, Mg, etc), metalloids and some non-metals (B, Si, P)
- Environmental studies: ocean water, soil
- Food industry
- Pharmaceutical industry
- Drinking water
- Biological & Biochemical Analysis: determination of trace metals in biological samples
- Pharmaceutical Analysis: analysis of pharmaceutically or therapeutically essential components of formulation
- Industrial Analysis: mining industries, petroleum industries, determination of metallic elements in food industry
Working Principle in AAS
- Based on the principle of Beer-Lambert Law
- Concentrations Determination in AAS: requires a minimum of five standards and a blank to fit the standard curve appropriately
Sample Preparation
- Categories of samples: Aqueous Solutions, Organic Solutions, Inorganic Solutions, Organic Solids, Gases
- Aqueous Solutions: little preparation is required, includes samples in raw and treated water, sea waters, biological fluids, plating solutions, effluents, wines, etc.
- Organic Liquids: can be directly aspired, includes petroleum products, solvents like m-heptene, aliphatic ketones, aliphatic esters, alcohols, xylene, cyclohexanes, isopropanol, etc.
- Inorganic Solids: require solvation using appropriate aqueous or acid medium, includes solid samples of fertilizers, ceramics, alloys, or rocks
- Organic Solids: require destruction via wet digestion or ashing in a furnace (muffle), includes materials of foods, leaves, tissue, biological solids, polymers, plants, feedstuff, etc.
- Gases: can be analyzed indirectly as liquid samples
Interference
- Increase or decrease in the size of the signal obtained from the analyte due to the presence of other known or unknown components in the sample
Test your knowledge on Atomic Absorption Spectroscopy (AAS) and its applications in environmental studies, food industry, and pharmaceutical industry. Learn about the different types of interference, including spectral, chemical, and ionization interference.
Make Your Own Quizzes and Flashcards
Convert your notes into interactive study material.
Get started for free
