An Improved Procedure for the Determination of Trace Elements in Silicate Rocks Using NH
4
HF
2
Digestion
1990 ◽
Vol 39
(12)
◽
pp. T169-T174
◽
2016 ◽
Vol 40
(4)
◽
pp. 583-597
◽
1986 ◽
Vol 81
(12)
◽
pp. 492-496
◽
1972 ◽
Vol 261
(2)
◽
pp. 126-127
◽