In general, transfer factor explains the potentiality of heavy metals being absorbed by plants. Whereas, enrichment factor is used to assess the pollution severity of heavy metals. 

Please check the attached links for further clarification.

http://link.springer.com/article/10.1007%2Fs10661-007-9678-2

http://link.springer.com/article/10.1007%2Fs11270-009-0041-9

http://www.sciencedirect.com/science/article/pii/S0016706104000084#

http://www.sciencedirect.com/science/article/pii/S037567421000141X

Thank you very much dear@Arif.

Dear Sir, you may also download my article "Use of sediment quality guidelines and pollution indicators for the assessment of heavy metal and PAH contamination in Greek surficial sea and lake sediments" from my profile. There you may find valuable information on the majority of pollution indicators (enrichment factor, degree of contamination, modified degree of contamination, Geoaccumulation index, etc.) and SQGs (sediment quality guidelines).

Dear Shankhadeep

I think this factor is related to the bio - concentration of heavy metals that is to say a transfer that is the middle to living organisms thus generating a spatio temporal bioaccumulation.

@Means what! Is it a new linguistic! I am afraid that evolution are revolution are taking place in linguistic very silently.

Enrichment factor is the degree of soil contamination and heavy metal accumulation in soil and plants growing on contaminated site with respect to soil and plants growing on uncontaminated soil whereas transfer factor is the ratio of the concentration of heavy metal in a plant to the concentration of heavy metal in soil. Measurement of EF and IF is essential of determine the efficiency of remediation including phytoremediation system.

Thank you sir. Yes in every sector of life, slow revolution is occurring!!! The way of communication is saving much more time now-a-days than what it was 30 years back.

Regards,

Shankhadeep