MS analysis of AmOx-extracted BIO Inc soil samples.
Two sets of standard addition samples were prepar
ed
from two AmOx-extracted BIO Inc soil samples: sampl
e 3 (SA3) and sample 9 (SA9). Each standard additi
on set
consisted of six samples. Five samples consisted o
f 0.8 mL soil extract and 0.2 mL standard P solutio
n (one in each
sample ranging from 3.4 to 31.6 ppm P). The remain
ing sample consisted of 0.8 mL soil extract and 0.2
mL DI
water. No internal standard was added to the sampl
es as the extractant itself (Ammonium Oxalate) func
tioned as an
internal standard. These samples were analyzed by
the MS procedure described above using instrument
specifications as listed in Table 2. The concentra
tions of P in SA3 and SA9 were determined from the
standard
addition peak areas