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level: Level 3

Questions and Answers List

Question	Answer
In atomic emission, a sample is subjected to a high energy to produce excited state, capable of emitting light The energy source: __	electrical arc, flame, plasma
Instrumentation AES	1 Flame 2 Monochromator/Filter 3 Detector
INSTRUMENTATION: FLAME (AES) The sample containing the metal is volatilised in a __ at 2000C. A higher temperature (2500C) may be obtained using air/acetylene and is required for analysis of __ by AES.	1 natural gas/ compressed air flame 2 Mg
The radiation emitted by the excited atoms is passed through a __, or a __ in more expensive instruments. Thus a narrow band of emitted radiation is selected and interfering sources of radiation such as the flame and other components in the sample are screened out	Filter/Monochromator
The intensity of the selected radiation is then measured using a photosensitive cell.	Detector
1 Elements to be analyzed needs to be in __ state. 2 __ is SEPARATION OF PARTICLES into individual molecules and breaking molecules into atoms . This is done by exposing the analyte to high temperatures in a FLAME OR GRAPHITE FURNACE.	1 atomic 2 Atomization
__ are subject to more interference problem insufficient energy for complete atomization	Cooler flames
__ are now used almost exclusively for AA are air-acetylene and N2O-acetylene (hotter, for many refractory forming elements)	two premix flames