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Substrate/CEC research
Hi All,
I've got a little more research to share. Chris Coleman sent me a
sample of Natural River Rock. His LFS sells it and he wanted it
tested. Pete Rose sent me a sample of Turface. I tested both for
total metals and CEC. Both samples resembled each other almost
identically, except the NRR had small, dark colored pebbles
included. Both crushed rather easily with the mortar and pestal into
a beige sand, unlike the brick-like Fluorite sample. Total metals
were analyzed from the crushed sample and the CEC was
anaylzed from the intact sample.
Element Turface(mg/kg) Natural River Rock(mg/kg)
Al 6590 9740
As 8.0 <
Ba 124 217
Be 0.7 0.9
Ca 3640 2560
Cd 0.3 <
Co 2.6 4.2
Cr 15.8 27.1
Cu 4.1 2.1
Fe 10700 14300
K 3210 3500
Mg 2730 3150
Mn 96 104
Na 574 642
Ni 11.8 8.3
Pb 6.6 <
Sb < <
Se < <
Sn < <
Tl < <
V 10.4 10.3
Zn 33.4 30.6
Ag < <
CEC Values: Turface 29.8 meq./100g
NRR 34.6 meq./100g
Old ones for comparison: Sand <0.1 meq./100g
Topsoil 24.3 meq./100g
Litter 27.0 meq./100g
Fluorite 1.7 meq./100g
I know there are probably dozens of commerically prepared
substrates (Dupla, Substrate Gold, etc.) for sale out there. Anyone
that has a COMMERICALLY prepared product they want tested
(metals and CEC), and are willing to share the results with
everyone on the list, contact me off-list and we'll see what we can
do. I won't test any "home-brews" since there are probably millions
of them out there and I am doing this at work on my spare time. I
hope I haven't bit off more than I can chew!
Jamie
Greenwood, SC
jjohnson at davisfloyd_com