346 A. LIVERSIDGE. 
500 ce. Coogee sea-water and 10 ce. of -017 AuCl, solution= 
0154 grains gold. 
(1) Treated with barium chloride yielded -0013 gr, 
(2) Filtrate treated with 1 gram. FeSO, & NH, ,, 0069 ,, 
0082 ,, 
i.e. a loss of 0072 grain gold or 46°75%. 
2000 cc. Coogee sea-water and 50 ce. of -01% AuCl, solution = 
0771 grains gold 
(1) Treated with 1 gramme lead acetate in 
acetic acid and precipitated by sheet zinc, yielded ‘0708 gr. 
(2) Filtrate treated with 1 gram. FeSO, & NH, ,, “0000 
0708 ,, 
i.¢.. a loss of (0063 grain gold or 8'17%. 
2000 ce. Jervis Bay sea-water and 25 cc. of 01% AuCl, solution 
_ ='0385 grains gold. 
(lt) Treated with 1 gramme lead acetate and 
precipitated by sheet zinc, yielded -0235 gr 
(2) Filtrate treated with 1 gram. FeSO, & NH, ,, 0010» 
0251 » 
2.¢., a loss of ‘0134 grain gold or 34°8%. 
It must be borne in mind that to the loss of gold sustained in 
ld also : 
tained : 
the above experiments should be added the amount of go 
present in the sea-water. The smallest loss seems to be sustal™ 
when the gold is precipitated by ferrous sulphate and ammonia, 
but even that process is far from satisfactory. 
Additional determinations of gold in sea-water from Coogee. 
2000 ce, treated with -5 gram. FeSO, and NH, yielded 00198 
=0°76 grains per ton. 
(1) 9000 ce. treated with 2°5 gram. 
of FeSO,, air blown through 
NH, added, yielded 0028 gr.- 0-31 gr- PP 
an 
(2) Filtrate treated with 1 gram. 
FeSO, and NH, added yielded -0035 gr. = 0°39 ge 2 
Total -0063 gr. =07 gh = 
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