Podcast
Questions and Answers
What is the purpose of reducing the volume of the sample on the hot plate during wet ashing?
What is the purpose of reducing the volume of the sample on the hot plate during wet ashing?
- To increase the temperature of the sample
- To accelerate the ashing process
- To allow for easy final transfer (correct)
- To remove excess water from the sample
What is the recommended temperature for ashing in a furnace during the modified dry-wet ashing method?
What is the recommended temperature for ashing in a furnace during the modified dry-wet ashing method?
- 600°C
- 525°C (correct)
- 700°C
- 400°C
What is the purpose of adding HNO3 to the ash during the modified dry-wet ashing method?
What is the purpose of adding HNO3 to the ash during the modified dry-wet ashing method?
- To dissolve the ash (correct)
- To neutralize the ash
- To remove excess carbon
- To increase the pH of the ash
Why may some potassium be lost during the modified dry-wet ashing method?
Why may some potassium be lost during the modified dry-wet ashing method?
What is the final step in the modified dry-wet ashing method?
What is the final step in the modified dry-wet ashing method?
What is the purpose of evaporating the sample in a microwave drying oven during the modified dry-wet ashing method?
What is the purpose of evaporating the sample in a microwave drying oven during the modified dry-wet ashing method?
What is the purpose of extracting or burning off high-fat samples prior to dry ashing?
What is the purpose of extracting or burning off high-fat samples prior to dry ashing?
What is the effect of using glycerin, alcohol, and hydrogen in dry ashing?
What is the effect of using glycerin, alcohol, and hydrogen in dry ashing?
Why is it necessary to use an appropriate blank determination when using an alcoholic solution of magnesium acetate to accelerate ashing of cereals?
Why is it necessary to use an appropriate blank determination when using an alcoholic solution of magnesium acetate to accelerate ashing of cereals?
What is a major disadvantage of dry ashing?
What is a major disadvantage of dry ashing?
What is the purpose of wet ashing?
What is the purpose of wet ashing?
What is a common problem associated with dry ashing at high temperatures?
What is a common problem associated with dry ashing at high temperatures?
What is the primary benefit of using microwave instrumentation for ashing?
What is the primary benefit of using microwave instrumentation for ashing?
What is the primary consideration in deciding between an open- or closed-vessel microwave system for wet ashing?
What is the primary consideration in deciding between an open- or closed-vessel microwave system for wet ashing?
What is the maximum sample size that can be processed in an open-vessel microwave system?
What is the maximum sample size that can be processed in an open-vessel microwave system?
What is the purpose of condensers in open-vessel microwave systems?
What is the purpose of condensers in open-vessel microwave systems?
What type of vessels are used in open-vessel microwave systems?
What type of vessels are used in open-vessel microwave systems?
How many samples can be processed in an open-vessel microwave system?
How many samples can be processed in an open-vessel microwave system?
What is the primary function of the vacuum pump in the microwave muffle furnace process?
What is the primary function of the vacuum pump in the microwave muffle furnace process?
What is a major advantage of the microwave muffle furnace method over other methods?
What is a major advantage of the microwave muffle furnace method over other methods?
What is the primary purpose of adding a small amount of oxygen to the glass chamber in the microwave muffle furnace process?
What is the primary purpose of adding a small amount of oxygen to the glass chamber in the microwave muffle furnace process?
Which of the following is a disadvantage of the microwave muffle furnace method?
Which of the following is a disadvantage of the microwave muffle furnace method?
What is the purpose of measuring the alkalinity of ash in food analysis?
What is the purpose of measuring the alkalinity of ash in food analysis?
Which of the following methods is used to analyze the surface contamination of fruits and vegetables?
Which of the following methods is used to analyze the surface contamination of fruits and vegetables?
What is the purpose of adding a reagent to the solution in precipitation?
What is the purpose of adding a reagent to the solution in precipitation?
What is the principle behind quantifying mineral content using a spectrophotometer?
What is the principle behind quantifying mineral content using a spectrophotometer?
What is the role of EDTA in complex formation?
What is the role of EDTA in complex formation?
What is the purpose of choosing an indicator-mineral complex?
What is the purpose of choosing an indicator-mineral complex?
What is the result of the reaction between the reagent and the mineral in precipitation?
What is the result of the reaction between the reagent and the mineral in precipitation?
What is the purpose of calibration curves in spectrophotometry?
What is the purpose of calibration curves in spectrophotometry?