ATAR Notes: Forum

VCE Stuff => VCE Science => VCE Mathematics/Science/Technology => VCE Subjects + Help => VCE Chemistry => Topic started by: vwinnie8 on May 26, 2011, 12:03:15 am

Title: whats the difference between AAS and UV visible spectroscopy?
Post by: vwinnie8 on May 26, 2011, 12:03:15 am

whats the difference between AAS (atomic absorption spectroscopy) and UV visible spectroscopy? im really confused between the two

Title: Re: whats the difference between AAS and UV visible spectroscopy?
Post by: Water on May 28, 2011, 03:13:08 pm

AAS , the solution,ions, is atomized. Beam /wave length of interest , is used to excite the atoms. This is used in applying for metals. Sample is put up against standard solution

UV Vis,same rule applies, except no atomizing. And also, put under UV Light because colour absorption may be invisible within visible eye. Sample is put up against standard solutions

Title: Re: whats the difference between AAS and UV visible spectroscopy?
Post by: scocliffe09 on May 29, 2011, 05:38:52 pm

Quote from: Water on May 28, 2011, 03:13:08 pm

AAS , the solution,ions, is atomized. Beam /wave length of interest , is used to excite the atoms. This is used in applying for metals. Sample is put up against standard solution

UV Vis,same rule applies, except no atomizing. And also, put under UV Light because colour absorption may be invisible within visible eye. Sample is put up against standard solutions

AAS - a hollow cathode lamp containing the metal of interest is used in conjunction with a monochromator to fire a specific wavelength of interest into the sample. AAS is thus more accurate and sensitive than most other techniques.
UV/Vis - either UV or Visible light (or both if qualitative) is used in a similar way, except this technique is not as sensitive because we have to select the wavelength.

Title: Re: whats the difference between AAS and UV visible spectroscopy?
Post by: nacho on May 29, 2011, 07:15:36 pm

for some reason, bitchnigs' comment made me laugh