196
ANALYTICAL CHEMISTRY
Table 11. Analysis of Soil Samples by Titan Yellow and Oxine (6) Procedures (Micrograms of magnesium per gram of \oil) Titan Yellow, No Titan Yellow Oxine Soil Sample Potassium Cyanide Potassium Cyanide Procedure 693 5.7 13.7 12.6
magnesium procedure. It is therefore advisable t o modify such procedures for tissue analyses in :L nianner similar to that suggested for soils.
+
The copper spray residues on leaf samples may result in sufficient copper in sample solutions to interfere with the titan yellow
LITERATIJRE CITED (1) Die-doff, M., and Nearpass, D. C., As
