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forensic toxicology - analytical techniques - ICP-MS - Statistics
General Stats
- This quiz has been taken 1 time
- The average score is 3 of 41
Answer Stats
| Hint | Answer | % Correct |
|---|---|---|
| what are the two components that make ICP-MS a hyphenated technique? | an ionisation source (inductively-coupled plasma) | 100%
|
| what gas is used to generate ICP? | high-purity argon gas | 100%
|
| the plasma is electrically charged, ionising the atoms | 100%
| |
| a detector (mass spectrometer) | 0%
| |
| how does ICP-MS present its data? | already in the form of a concentration | 0%
|
| what additional preparation do complex solid samples need for ICP-MS analysis? | a period of digestion in acid (often at high temperature) | 0%
|
| what are the limitations for ICP-MS? | atoms with a mass of 40 cannot be measured | 0%
|
| because argon will combine with oxygen to form ArO, which has a mass of 56, the same as the mass of iron | 0%
| |
| why is it used instead of ICP-MS? | because it is a much cheaper technique | 0%
|
| why is the plasma ICP-MS uses for analysis called inductively-coupled plasma? | because it is ionised by inductive heating of a gas with an electromagnetic coil | 0%
|
| why does ICP-MS have these limitations? | because it uses argon, which also has a mass of 40 | 0%
|
| both raw and corrected data | 0%
| |
| collisions between argon atoms and electrons | 0%
| |
| how do we prepare solids for ICP-MS analysis? | dissolve them using an acid, most commonly nitric acid (HNO3) | 0%
|
| what is it also used for? | environmental and industrial monitoring | 0%
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| eventually equilibrium is reached and stable plasma is achieved | 0%
| |
| what does the mass spectrometer do to this prepared sample now? | focusses the atoms through an ion beam | 0%
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| how are samples typically prepared for ICP-MS analysis? | in a liquid state or solids that are fully dissolved | 0%
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| how do we want to introduce the samples to the instrument? | in as little liquid as possible | 0%
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| what is ICP-AAS? | inductively-coupled plasma atomic absorption spectrometry | 0%
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| what is ICP-MS? | inductively-coupled plasma mass spectrometry | 0%
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| what is its major downside? | it can only analyse a single element at a time | 0%
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| how does this instrument work? | it converts a liquid to an aerosol (a fine mist) using a nebulising gas which can then be drawn into the plasma | 0%
|
| it is very difficult to measure iron | 0%
| |
| what does this produce, and what does that then allow? | it produces ions & electrons, and allows the gas to conduct electricity | 0%
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| in simple terms, what has been done to the sample to prepare it for analysis? | liquid has been removed | 0%
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| what is the range of its ability to profile elements? (element names or molecular weights) | lithium (MW: 7) to uranium (MW: 250) | 0%
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| what is it used for primarily? | metal analysis for toxicology | 0%
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| microwave | 0%
| |
| how does it generate ICP? | more and more energy is added to the system by increasing the temperature | 0%
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| what is the most common mass spectrometer for ICP-MS? | quadrupole mass analyser | 0%
|
| separates the atoms by size & allows them to be detected | 0%
| |
| some of the argon atoms to lose electrons | 0%
| |
| once this is complete, what can happen now? | the atoms can be analysed using the mass spectrometer | 0%
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| the atoms have been ionised | 0%
| |
| once the sample has been introduced to the instrument, what happens to the sample? | the molecules are broken down to their constituent atoms by extreme heat | 0%
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| the molecules have been broken down into atoms | 0%
| |
| until | 0%
| |
| how is this achieved? | using an instrument called a nebuliser | 0%
|
| which causes | 0%
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| which causes | 0%
|
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