Deproteinization of Nonammonia and Ammonia Natural Rubber Latices by Ethylenediaminetetraacetic Acid

Table 2

Magnesium ion content of FNRL and FNRL deproteinized by using EDTA-4Na.

Samples	Preservatives	EDTA-4Na (wt%)	Mg^2+ content (ppm)
FNRL	—	—	657
FR-NH3	Ammonia	—	294
FR-SH	SH	—	635
FR-NH3 DPNR	Ammonia	0.05	152
FR-NH3 DPNR	Ammonia	0.10	123
FR-NH3 DPNR	Ammonia	0.20	89
FR-SH DPNR	SH	0.05	417
FR-SH DPNR	SH	0.10	341
FR-SH DPNR	SH	0.20	289