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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
Which of the following sets of quantum numbers is correct for an electron in 4f orbital: (1) n-=4, l=3. m+1, s= +1/2 (2) n-=4, l=4. m-4, s= -1/2
A reverse osmosis membrane is used to desalinate high salinity groundwater. It is proposed to build an RO plant that will process about 500,000 liters/day of saline feed water cont
The equilibrium constant Kp=4 at 1993K for the reaction H2+CO2->H2O+CO. INitially H2 and CO2 having 0.8 moles were injected in 5l flask. Find equilibrium concentration of CO2.
Q. Illustrate Aromatics compounds? Ans. Benzene (C 6 H 6 ) is the prototype of an important class of hydrocarbons called aromatic compounds. Benzene is a ring of 6 carbon
Calculations of Volumetric analysis The subsequent points should be kept in mind while making calculations of volumetric exercises. (i) 1g equivalent mass of a substance car
Can we vary the pressure while phases remain in equilibrium? Consider a system containing only NH 4 Cl(s), NH 3 (g), and HCl(g). Assume that the equilibrium NH 4 Cl(s) ↔ NH
common properties
Threshing The process of threshing separates the kernels from the stalks or panicles on which they grow. Threshing may take place in the field, or at the homestead or village;
Why phenol can also be prepared from chlorobenzene(Dow''s process)
The total number of valence electrons in 4.2 gm N-3 of ion is ( NA is the Avogadro''s number): (1) 1.6NA
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