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Nebulisation techniques:
The accuracy, precision and detection limits of flame AAS depend on how the analyte sample is introduced into the atomiser. We need to transfer a reproducible and representative portion of a sample into an atomiser which depends on the physical and chemical state of the analyte and the sample matrix. The sample introduction is achieved with the help of a nebuliser. The generally used nebulisation techniques are ultrasonic nebulisation, pneumatic nebulisation, electrothermal vaporisation and hydride generation.
Atomic absorption spectrophotometry (AAS) is now a routinely and widely employed technique for trace and ultratrace analysis of complex matrices of geological, biological, glass, environmental, industrial, cement, marine sediment, pharmaceutical, engine oil or any other kind of samples. An atomic absorption techniques using flame are rapid and precise and are applicable to about 67 elements. The electrothermal methods of analysis instaed are slower and less precise; thus, these are more sensitive and require much smaller samples
Q. Give the general formula of Organic Acids? Ans. Organic acids have the general formula RCOOH. The R- is an alkyl group or hydrogen. The functional group is -COOH and
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Time taken for an electron to complete one revolution in the Bohr orbit of hydrogen atom is: (1) 4 Π mr 2 / nh (2) nh/ 4Π 2 mr (3) nh/ 4Π 2 mr 2
A baseball weighs 5.19oz oz . What is the kinetic energy in joules of this baseball when it is thrown by a major-league pitcher at 93.0mph mph ?
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Calculate ionisation potential of the electron in the first exited state of singly ionised Helium atom is given by ionisation of Hydrogen atom to be 13.6 eV. Ans: According to
corrosion
reaction of mono hydric alcohol
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