Compared to other lab$-$based methods, what is a major limitation of the length of stain detector tubes like those that we used in the lab?

a$)$ They are very expensive to use

b$)$ They are technically difficult to use

c$)$ They are relatively inaccurate

d$)$ They must be shipped to a lab for analysis

A collection technique that makes use of a solid sorbant tube containing material such as charcoal is referred as:

a$)$ adsorption

b$)$ absorption

c$)$ vapor trapping

d$)$ infrared testing

How many milligrams are in $1000mg?$

You took an air sample at $0\mathrm{.}2lpm$ for $12$min using a solid sorbent tube and tested for the presence of toluene. The lab reports the following amounts of toluene in your sample.

Primary chamber

$250mg$

Backup chamber

$55mg$

a$)$ If the MW of toluene is $92\mathrm{.}1,$ what is the concentration in ppm$?$

b$)$ Is the amount of toluene collected in the backup chamber acceptable? If not, why not and what are you going to do about it$?$

If the TLV is $50ppm,$ are your results above the TLV$?$ How confident are you of this answer?