Deproteinization of Nonammonia and Ammonia Natural Rubber Latices by Ethylenediaminetetraacetic Acid

Table 3

Nitrogen content of FNR and deproteinized FNR prepared using various EDTA complexes at 0.10 wt%.

Samples	Preservatives	pH	0.1 wt% EDTA complexes	Nitrogen content (wt%)
FNR	—		—
FR-NH3	Ammonia		—
FR-SH	SH		—
FR-NH3	Ammonia		EDTA-1Na
FR-NH3	Ammonia		EDTA-2Na
FR-NH3	Ammonia		EDTA-3Na
FR-NH3	Ammonia		EDTA-4Na
FR-SH	SH		EDTA-1Na
FR-SH	SH		EDTA-2Na
FR-SH	SH		EDTA-3Na
FR-SH	SH		EDTA-4Na