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One limitation of SPME methods is the limited adsorption capacity of the fiber due to the short length (~1 cm) and diameter (~100 um) typically exposed to Analytes. Explain for the analysis of drinking water samples for chloroform, the SPME fiber is normally immersed into a 3.0mL volume of water for 30 minutes as well as then injected directly into a GC. Detection utilizing an electron capture detector provides an absolute limit of detection of 0.5 pg for chloroform. The maximum mass of chloroform that can be adsorbed by the fiber after a 30 minute exposure is 350 ng. The extraction efficiency for chloroform utilizing the SPME method is 85% throughout the entire concentration range that can be determined. The million dollar question- Explain what concentration range (in ug/L) can be determined using this technique?

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