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a<br />
b<br />
c<br />
d<br />
e<br />
t<br />
a<br />
b<br />
c<br />
d<br />
e<br />
f<br />
I<br />
(a)<br />
(b)<br />
(c)<br />
(d)<br />
(e)<br />
(f)<br />
(s)<br />
pH<br />
7.t<br />
7.4<br />
7.2<br />
7.9<br />
7.8<br />
7.5<br />
9.t<br />
Ca<br />
ND<br />
ND<br />
66<br />
68<br />
5l<br />
45<br />
64<br />
-6'<br />
Table 4 : Samples from margins of high islands<br />
(Southern Cook group)<br />
Mg<br />
r0<br />
hD<br />
I2<br />
L5<br />
102<br />
,7<br />
l0l<br />
Mauke, makatea drillhole<br />
Rarotonga airport<br />
Mauke, Vaitango cave<br />
Atiu, Te Miro cave<br />
Atiu, Vaiakururu cave<br />
Atiu, Piripuroto cave<br />
Mitiaro, Lake Te Rotonui<br />
pH Ca M9<br />
7.' 41<br />
7.t 47<br />
7.4 @<br />
7.2 t04<br />
7.2 100<br />
8.5 105<br />
(a)<br />
(b)<br />
(c)<br />
(d)<br />
(e)<br />
(f)<br />
22.O<br />
5.t<br />
8.0<br />
5.0<br />
10.0<br />
7,0<br />
Total<br />
Alkalinity Cl<br />
68<br />
,98<br />
2t8<br />
2t0<br />
246<br />
220<br />
t5<br />
29<br />
?7<br />
r07<br />
210<br />
147<br />
t50<br />
1580<br />
soa<br />
]J<br />
L6<br />
ta<br />
28<br />
22<br />
48<br />
r84<br />
Table 5 : Samplgs from raised coral islands<br />
Total<br />
Total Hardness<br />
Alkalinity Cl SOO as Ca CO, Mn<br />
245<br />
148<br />
?19<br />
550<br />
t19<br />
t55<br />
7L<br />
124<br />
25t<br />
21 4<br />
98 I8<br />
44 ND<br />
209<br />
B'<br />
194<br />
290<br />
to5<br />
292<br />
Niue, Tuku'ofe cave<br />
Niue, Vaiola factory bore<br />
Niue, Liku Developrnent Block bore<br />
Tmgatapu, Tr.pou College well<br />
Tangatapu, Hu'atolitoli well<br />
Tcrgatapu, Veiola Hcpital well<br />
Total<br />
Hardness Metals<br />
as Ca CO, Fe+Mn<br />
0.0I 0.02<br />
0.01 2.or<br />
0.01 0.15<br />
0.01 0.01<br />
0.01 0.01<br />
0.01 0.0r<br />
76<br />
J2T<br />
215<br />
ND<br />
548<br />
ND<br />
576<br />
Metals<br />
Fe Cu<br />
low<br />
low<br />
low<br />
Iow<br />
low<br />
low<br />
low<br />
Zn<br />
0.01 0.0r<br />
0.07 0.45<br />
0.05 0.7t<br />
0.01 0.12<br />
0.01 0.20<br />
0.01 o.o2<br />
. Tb samplel strow some similaritieg within the two sets. Calcium level, total alkalinity,<br />
chloride and total hardness are apparently higher in the Tongatapu bore samptes than thoie<br />
from Niue. All analyses for retals are low bul of interest arJ the very slightiy elevated zinc<br />
figures from Niue dr.re probably to galvanized pipes although soils 6l ttjue are all deficient in<br />
zinc which is pplied s a pesture and crop fertilizer.<br />
Our final gnoup of samples was laken from galleries m an etoll in Kiribati. Water<br />
comes from a very thin lens contained within the limestone rock. Highest lend elevation is<br />
only a few metree agl. Values are given in Table.6 and ere similar to tf,ose given by Jacobson<br />
(197O for Hsne lsland, Cocos group (lndian Ocean).<br />
Reoults from atoll weters sppear similar to those of raiged coral islands. Both semples<br />
were high in total alkalinity. Chloride level will be influenced by the sampling site in relation<br />
to the thicknees of the freeh-water lens.
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