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(a) Percent of NEC (NEC/TC × 100%) present in various laboratory, environmental, and biological matrices. (b) Percent NEC mass remaining from various matrices and percent mass remaining for three CNTs representing the lower (MW-F) and upper (MW-15) range of weak CNTs and strong (MW-Arc) CNTs. NEC mass is the percent remaining after treatment under inert conditions such that all volatile OC has been removed.
