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Listening Quiz: Phát Hiện Chất Ô Nhiễm Mới Nổi Trong Nước Ngầm – Medium Level
Th7 24, 2024
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bởi
Anna Phạm
trong
Tiếng Anh Hóa Học (English for Chemistry)
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1.
What are William and Laura mainly discussing?
Ways to speed up water treatment in a factory
How to remove contaminants from groundwater
The chemical structure of a new laboratory tool
A method for detecting a difficult-to-find contaminant
Explanation:
They discuss choosing a new method to detect an emerging contaminant in groundwater, including the analysis technique and sample preparation.
2.
According to Laura, what method should they use to detect the contaminant?
Gas chromatography with flame ionization
Simple filtration followed by heating
A microscope and staining agent
Liquid chromatography with mass spectrometry
Explanation:
Laura specifically suggests liquid chromatography with mass spectrometry.
3.
What does Laura say about the contaminant’s properties?
It is radioactive and highly unstable
It is mostly organic and present in low concentrations
It is metallic and easy to separate
It is only found in large amounts
Explanation:
William says the contaminant is mostly organic and present in low concentrations.
4.
What sample preparation step is needed before testing?
Adding dye to make it visible
Drying the sample in sunlight
Boiling the water for one hour
Extracting the contaminant using solid-phase extraction
Explanation:
Laura says they need to extract the contaminant using solid-phase extraction.
5.
What can be inferred about the labs Laura mentions?
They need to order entirely new instruments before testing
They probably already have the equipment needed for this method
They cannot perform any water-quality analysis
They only work with contaminants that are easy to detect
Explanation:
Laura says the method requires special equipment, but most labs studying water quality have it, so it can be inferred that those labs probably already have the needed equipment.
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