Method 4 Standard 1

Tris(4-isopropylphenyl) phosphate,50 µg/mL,toluene,1mL,

Phosphorous Standards Phosphorus in Isooctane Tri-n-butylphosphate, 99+% (Chiron product nr. 1399.19) CAS [126-73-8] Matrix: Isooctane , 20cSt Units: 1x25mL, 1x100mL Isooctane

Custom Mix of 4-Nonyl- and 4-t-Octylphenols ethoxylates, 100/20µg/ml in Acetone, 5x1ml