Determination of Metal Impurities in Carbon Nanotubes Sampled Using Surface Wipes

Table 1

Metal concentrations (>0.5%) of NIST 2483, Test-CNT, and Aldrich-CNT obtained with both microwave digestion (MD) and ultrasonic digestion (UD) methods. The results are presented as mean (μg/g) and standard deviation of five independent determinations. Certified values for Co and Mo in NIST 2483-CNT SRM and methods LODs are presented in Table 3.

Tested CNT	Element	Mean ± STDEV (μg/g)
		MD	UD
NIST 2483	Cobalt
	Molybdenum
Test-CN	Cobalt
	Nickel
	Yttrium
Aldrich-CN	Nickel
	Yttrium

D () and D ().