Cytotoxicity of Carbon Nanotubes on J774 Macrophages Is a Purification-Dependent Effect

Table 1

Analysis of elements found in unpurified (UP) or purified (P) samples of CNT₁ and CNT₂.

	CNTs1 % weight^*		CNTs2 % weight^*
Element	UP-CNTs1	P-CNTs1	UP-CNTs2	P-CNTs2
C	94.83	93.23	95.56	75.98
O	1.26	4.26	1.22	22.21
Fe	3.89	1.12	3.23	1.81
Total	100	100	100	100

^*Element content was determined by semiquantitative analysis of elemental composition.