P AGE 20 Code 2A Humus Code 2B V egetation INAA provides a very cost ef fective rapid means of analyzing humus or vegetation to very low detection limits f o r g o l d a n d m a n y o t h e r e l e me n t s u s e ful for geochemical exploration The organic material is dried below 60C macerated and a 15 g aliquot is com pressed into a briquette and analyzed using Code 2A or Code 2B depending on whether the material is purely or ganic Code 2B or contains mineral matter Code 2A These briquettes are irradiated and their gamma ray spectra are measured a nd quantified The advantages of this technique are simplicity less chance of human error and contamination ashing is costly and the results in loss of gold and INAA is the technique with ultimate sensitivity for gold and other trace ele ments Prices listed in Codes 2A and 2B are for standard 15 g briquettes Selected elements may be available at lower costs Code 2C V egetation Ash INAA Code 2C1 V egetation AshICPOES Prices for Code 2C1 for single element is 580 with each additional element costing 240 Code 2D V egetation AshICPMS Some geologists prefer ashing sam ples at low temperature 480C and determining metals on the ash This may be advantageous particularly if base metals are also required for your gold project or for base metal explo ration Note when samples are ashed there may be volatile loss of certain el ements Au As Br Hg Cd etc Re sults are reported on an as received basis Code 2D uses a proprietary acid digestion on the ash followed by ICPMS and extends the list of ele ments which are available Not all ele ments may be total This package can be quite useful for diamond explo ration Code 2E This package is similar to Code 2D but requires a dif ferent digestion of the plant ash to obtain Au Pt and Pd to low levels This method has been shown to be very ef fective for PGE explo ration Code 2F Dry vegetation samples are dissolved in acid and analyzed by High Resolu tion ICPMS Code 2FPGE Actlabs has developed a new package capable of detecting the PGE in vege tation at the subppb level by mi crowave digestion ion exchange and High Resolution ICPMS This method eliminates interferences Code 2G Dry vegetation samples are dissolved in acid and analyzed by ICPMS RECOMMENDED Biogeochemistry Humus V egetation Humus V egetation Ash Base Metal Ash Package Ash Package V egetation V egetation V egetation INAA INAA Package V egetation Digestion ICPMS Unashed Unashed U nashed INAA Aqua RegiaICP ICPMS AuPtPd ICPMS HRICPMS Code 2A Code 2B Code 2C Code 2C1 Code 2D Code 2E Code 2Gall ppb Code 2Fall ppb Code 2FPGE Ag 2 03 ppb 2 02 02 02 10 1 Al 2 2 1000 As 1 001 05 1 3 60 5 Au 1 ppb 01 ppb 5 ppb 5 ppb 02 01 B 2 5 5 400 200 Ba 100 5 50 3 3 5 1 ppm Be 0005 008 30 01 Bi 005 00 5 20 1 Br 1 001 1 Ca 05 001 02 01 01 300 2 ppm Cd 001 001 4 01 Ce 1 01 3 001 001 2 05 Co 1 01 1 001 001 2 05 Cr 1 03 1 1 10 40 10 Cs 05 005 05 0001 0001 02 01 Cu 1 02 02 90 20 Dy 0001 0001 02 005 Er 0001 000 1 02 005 Eu 02 005 001 0001 0001 08 01 Fe 005 0005 005 001 001 2 05 ppm Ga 01 01 1 05 Gd 001 001 2 1 Ge 01 01 10 10 Hf 05 005 05 001 001 2 2 Hg 05 005 1 10 5 Ho 0001 0001 02 001 In 1 ppb 1 p pb 1 01 Ir 5 ppb 01 ppb 2 ppb 02 ppb K 001 005 001 001 60 10 ppm La 01 001 01 0002 0002 3 02 Li 05 0 5 20 5 Lu 01 0001 005 0001 0001 02 02 Mg 001 001 600 05 ppm Mn 1 01 01 20 10 Mo 05 005 2 1 01 01 1 1 Na 100 1 10 001 001 400 10 ppm Nb 0005 0005 2 05 Nd 3 03 5 0002 0002 1 02 Ni 10 2 50 1 5 5 3 01 ppm P 300 Pb 1 01 01 20 10 Pd 3 ppb 7 2 01 ppb Pr 0002 000 2 5 05 Pt 2 ppb 4 2 02 ppb Rb 20 1 5 001 001 20 10 Re 01 ppb 01 pp b 1 01 Rh 01 ppb Ru 10 ppb 02 ppb Sb 01 0005 01 002 002 4 02 Sc 01 001 01 05 05 1 Se 2 01 2 1 10 30 02 ppm Si 02 02 Sm 01 0001 01 0001 0001 02 01 Sn 1 100 40 Sr 100 10 300 01 01 100 20 T a 05 005 05 0001 0001 1 01 Tb 02 01 05 0001 0001 3 002 T e 001 00 1 3 1 Th 05 01 01 0001 0001 10 5 Ti 1 1 50 20 Tl 0001 00 01 1 05 Tm 0001 0001 01 005 U 01 001 01 0001 0001 1 1 V 1 10 20 10 W 1 005 1 05 05 10 5 Y 0001 000 1 1 02 Yb 01 0005 005 0001 0001 1 04 Zn 20 2 50 1 1 1 5 02 ppm Zr 05 0 5 20 5 Price 1900 2200 2100 1 100 2700 3400 3500 6400 12000 All elements are in ppm except where noted and Code 2F Code 2FPGE and Code 2G which are in ppb except where noted Actlabs only ashes vegetation in dedicated vegetation ashing furnaces to avoid contamination