Group 5 by Tay Kheng Soo https://padlet.com/khengsoo/ibxpaxwnqr8w en-us 2016-11-21 13:57:21 UTC 2024-07-19 03:40:32 UTC hello@padlet.com https://padlet.com/khengsoo/ibxpaxwnqr8w/wish/139540077 Saya]]> 2016-11-23 09:40:36 UTC https://padlet.com/khengsoo/ibxpaxwnqr8w/wish/139540077 https://padlet.com/khengsoo/ibxpaxwnqr8w/wish/139540088 Saya]]> 2016-11-23 09:40:40 UTC https://padlet.com/khengsoo/ibxpaxwnqr8w/wish/139540088 We will discuss on Q3(b) https://padlet.com/khengsoo/ibxpaxwnqr8w/wish/139546120 2016-11-23 10:12:11 UTC https://padlet.com/khengsoo/ibxpaxwnqr8w/wish/139546120 Why Ali is working alone? https://padlet.com/khengsoo/ibxpaxwnqr8w/wish/139547286 2016-11-23 10:17:25 UTC https://padlet.com/khengsoo/ibxpaxwnqr8w/wish/139547286 Detector for Orgnosulfur - Flame Photometric detector (FPD) Operation Principle https://padlet.com/khengsoo/ibxpaxwnqr8w/wish/139550689 Flame Photometric Detector or GC-FPD is a technique used to analyse sulphur or phosphorous containing compounds and metals such as tin, boron, arsenic and chromium. An FPD uses a Hydrogen/Air flame into which the sample is passed. Phosphorous and sulphur containing hydrocarbons generate chemiluminescene at specific wavelengths which when passed into a photo-multiplier gives an electrical signal which can then be measured. 

Advantages : 
1)Not limited to sulfur and phosphorus containing compounds but also detects N, As, Sn, Se, Ge, Te, Sb, Br, Ga, In, Cu

2) Have 3 types - single flame, dual flame, pulsed-flame photometric detector.

Disadvantages :  
1)mechanism is not completely understood because of the complex nature of the process occurring in the flame.

2) use large sample and solvent adversely effects the light emision by changing the temperature and geometry of the flame


]]> 2016-11-23 10:34:23 UTC https://padlet.com/khengsoo/ibxpaxwnqr8w/wish/139550689 Detector for Organochlorine pesticide - Electron Capture Detector https://padlet.com/khengsoo/ibxpaxwnqr8w/wish/139552901 Principle A radioactive beta emitter, nickel (Ni-63), is a component of an ECD. The beta particles ionize a gas which causes a background current to flow in the ECD circuitry. If a sample absorbs some of the negative electron ions (a process called ionizing electron capture) the current is reduced. The current fluctuation therefore reveals the presence of the sample components

Advantages :
High sensitivity and selectivity for analyte with electophilic functional group, non-destructive

Disadvantages : 
Use radioactive source, most easily contaminated detectors, affected by oxygen and water


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