Subject Code : BIO8201
BIO8201 - Advanced Analytical  Tools for Food Security - Confirmatory Techniques Biology Assessment  Paper
Assessment Task:

 

Questions:

Q1. Briefly summarise the fundamental principles of the technique Inductively Coupled Plasma Mass Spectroscopy (ICP-MS).

Q2. An ICP-MS iCAP Qs can be considered as 4 distinct functional units, for optimum performance, each of the units must be optimized by the operator. What is the correct order of these units in terms of sample progression through the system?

a - injection of the ions into the vacuum system > mass filtering by quadrupole > mass filtering by hexapole > amplification + measurement
b - sample introduction > injection of the ions into the vacuum system > mass filtering by quadrupole > signal amplification + measurement.
c - sample introduction > injection of the ions into the vacuum system > mass filtering by hexapole > signal amplification + measurement.
d - injection of the ions into the vacuum system > separation of the ions by mass/charge > focusing of the ion beam by the electrostatic lenses > signal amplification + measurement.
e - sample introduction > injection of electrons into the vacuum system > mass filtering by quadrupole > signal measurement + amplification.

Describe how you might begin to troubleshoot a sensitivity problem?

Q3. A concentric nebulizer is a free aspirating nebulizer that generates a sample aerosol with a wide range of droplet sizes. What is the mean droplet size that ICP works efficiently with? and what percentage of the original sample aerosol actually has the correct size and travels to the plasma for ionization?

a - 1 mm, 5%
b - 100 µm, 1%
c - 20 µm, 10%
d - 10 µm, 1%
e - 1 µm, 0.1%

How might you know that there is a sample aspiration problem?

Q4. The functions of the Peltier-cooled Spray Chamber are to:

a - stabilize the spray chamber temperature to reduce the effects of room temperature changes and reduce water vapour pressure in the spray chamber resulting in lower water loading of the plasma and lower oxide interferences
b - stabilize the spray chamber temperature to reduce the effects of room temperature changes and increase water vapour pressure in the spray chamber resulting in lower water loading of the plasma and lower oxide interferences
c - stabilize the spray chamber temperature to reduce the effects of room temperature changes and reduce signal noise levels associated with peristaltic pump pulsation
d - increase water vapour pressure in the spray chamber resulting in lower water loading of the plasma and lower oxide interferences and reduce signal noise levels associated with peristaltic pump pulsation
e - increase the viscosity of the sample to increase the amount of sample reaching the plasma

Q5. A characteristic of the argon ICP is that the great majority of the elements form mainly:
a - double charged, negative ions
b - double charged, positive ions
c - single charged, negative ions
d - single charged, positive ions
e - electrons

What is the benefit of forming one ion species when it comes to ion quantification?

Q6. The first ionization potential of argon is 15.8eV and most elements achieve their first ionization potential at a temperature of approximately 7500K. This temperature is achieved at approximately 12-14mm from the load coil. What percentage of the elements in the periodic table is more than 75% ionised in an argon plasma?
a - 60%
b - 70%
c - 75%
c - 80%
d - 85%
d - 90%

Q8. Monoisotopic elements require special consideration because of ion inferences. In which of the following lists do all the elements only have one stable isotope.
a - Cd, Pb, Mn, Co, As, Bi
b - Be, Na, Mn, Co, As, Cd
c - Be, Na, Mn, Co, As, Bi
d - Be, Na, Fe, Co, As, Bi

Q9. You are presented with an unknown water sample that your client wishes you to analyse for both major and minor elements on ICP-MS. What method from the ones listed below would be the most appropriate, given that you don’t know the elemental make-up of the sample?
a – Scanning and standard resolution mode
b – Time-resolved analysis and high-resolution mode
c – Scanning Peak jumping and standard resolution mode
d – Scanning and high-resolution mode

Q10. Find a paper published in 2017 that employed Triple Quadrupole Mass Spectrometry? Describe briefly how the instrument was used? What was measured? And what was discovered? List the title, journal, year of publication and associated volume and page numbers.

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  • Posted on : November 07th, 2018

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