Question

The true absorbance of a sample is 1.500, but 0.50% stray light reaches the detector. Find the apparent transmittance and apparent absorbance of the sample. How much stray light can be tolerated if the absorbance error is not to exceed 0.001 at a true absorbance of 2? A research-quality spectrophotometer has a stray light level of greaterthan0.000 05% at 340 nm. What will be the maximum absorbance error for a sample with a true absorbance of 2? Of 3?

Answer 1

a) True absorbance 1.500 Percentage stray lights 0.50% Txue tiansmittance? rom Noca since stray light is the extra liğht iat bypasses the sarm ple 60 Apparrent Trans mitanceTsue transmiLtane at Apparent Trans mittance be X >-.xr(1-0,50).ㅡ.,.- % も 3 31698- 3.1623 LOO て100-0.50 St 782-2.1782 At Absorbance- left -1,502 pp aren