P AGE 33 Sequential Leaches Sequential leaches can target specific soil or rock phases and allow a better inter pretation of the geochemical processes involved A sample will undergo sequential leaching process starting with the weakest leach to the strongest leach with subse quent analysis of each of the leachates by ICPMS Some of the potential leaches which can be combined sequentially include from the weakest to the strongest Code 7 W ater A distilled water leach to extract the water soluble component Code 7 Enzyme SE Selectively goes after amorphous Mn oxides Code 7 Bioleach A leach proprietary to Actlabs that has been designed to extract dead bacterial remnants Code 7 Sodium Acetate For exchangeable cations adsorbed by clay and Leach pH 5 elements coprecipitated with carbonates Code 7 Sodium 01M leach for elements adsorbed by organic material Pyrophosphate humic and fulvic components Leach Code 7 MIG Leach For mobile metal components Code 7 Hydroxylamine For amorphous Fe oxides and crystalline Mn oxides Leach cold Code 7 Hydroxylamine For amorphous and crystalline Fe oxides and Leach hot crystalline Mn oxides Code 7 Aqua Regia Will leach sulphide species and clay minerals Code 7 Four Acid Will dissolve silicate remnant material Note There is a 20000 setup charge per leach chosen if there are under 10 samples Addons Final pH of leach solution 800 Conductivity of leach solution 800 pH and conductivity 1250 Sodium Sodium Sodium Hydro Pyro Pyro Acetate xylamine phosphate phosphate Leach Leach Leach HRLeach Ag 500 8 5 10 Al 10 ppm 5 ppm 10 ppm As 300 160 30 40 Au 5 28 5 5 B 970 Ba 300 16 1000 50 Be 50 4 10 20 Bi 40 1 10 100 Br 300 2009 500 2000 Ca 500 ppm 20 200 ppm 700ppm Cd 20 1 10 5 Ce 40 8 3 2 Co 50 4 5 5 Cr 500 24 100 5000 Cs 2 4 2 5 Cu 600 40 100 40 Dy 5 01 2 1 Er 1 01 1 1 Eu 5 01 1 05 Fe 50 ppm 400 5 ppm 10 ppm Ga 20 4 10 5 Gd 5 01 1 1 Ge 300 4 5 10 Hf 5 04 2 5 Hg 200 160 20 20 Ho 1 004 05 05 I 1000 80 100 200 In 2 04 1 05 K 50 ppm 4000 20 ppm 50 ppm La 20 8 2 2 Li 1000 120 100 50 Lu 1 004 05 05 Mg 10 ppm 800 5 ppm 10 ppm Mn 300 400 100 40 Mo 40 16 20 20 Na 50 ppm Nb 20 04 1 05 Nd 20 04 2 2 Ni 1000 200 30 80 Os 100 100 100 Pb 1000 12 40 20 Pr 5 01 05 05 Pt 100 100 100 Pd 100 100 100 Rb 20 20 20 10 Re 1 04 05 05 Ru 100 100 100 Sb 20 4 5 5 Sc 300 40 200 200 Se 700 600 600 200 Sm 10 1 2 2 Sn 24 10 100 Sr 100 40 100 100 T a 3 2 1 05 Tb 1 01 1 05 T e 200 4 50 10 Th 100 01 1 05 T i 40 400 500 Tl 100 04 05 1 Tm 1 04 1 05 U 200 04 1 05 V 200 2 20 500 W 30 4 10 5 Y 10 1 1 05 Yb 2 02 3 05 Zn 1000 1600 2000 500 Zr 100 4 80 400 Price 4000 5000 4000 4000 SemiQuantitative All elements are in ppb