Table 2.

Mass yields from the insoluble and precipitated fractions (Fig. 1, steps XI and XVI) and pH in the extraction solution

		Sodium citrate	Sodium carbonate	Sodium oxalate	Sodium succinate	Sodium acetate	Sodium chloride	Water	Sodium hydroxide
Insoluble %(w/w)	Average	13.0 ± 0.16	14.0 ± 0.57	18.4 ± 0.21	24.2 ± 0.29	26.9 ± 0.34	28.8 ± 0.53	36.0 ± 0.42	14.8 ± 0.86
	T.DIST(0.95)	0.21	0.73	0.28	0.37	0.44	0.68	0.54	1.12
Precipitated %(w/w)	Average	21.3 ± 1.09	20.9 ± 0.50	20.1 ± 1.08	7.0 ± 0.53	5.2 ± 1.11	4.3 ± 0.54	2.2 ± 0.15	9.5 ± 0.29
	T.DIST(0.95)	2.278	1.039	2.251	1.102	2.314	1.119	0.321	0.611
pH	Before extraction	9.28	11.32	9.31	9.38	9.30	9.31	9.36	12.72
	After extraction	7.79	10.73	7.14	7.19	7.26	7.11	7.28	12.79

± indicates standard deviation. The number of sample duplicates was six for the insoluble fraction and four for the precipitated fraction. T.DIST(0.95) indicates the double sided T-distribution (95 %) confidence intervals