APHA & ASTM By the Specific Ion Method Suitability as buffer - Pass Test 2. pH 5.3 - 5.5

Reagent solution for the determination of microgram amounts of EDTA, B Kratochvil and M.C. White, Anal. Chem., 37, 111 (1965)

Mixed phosphate buffer. Approximate tetrabutylammonium ion concentration 0.5 M.

(C₈H₁₇)C₆H₄(OCH₂CH₂)_nOH CAS#: 9036-19-5 Polyoxyethylene(10) isooctylphenyl ether. n in formula is about 10.

TEST Suitability - Pass test Color - Colorless to very faint yellow Clarity / Form - Clear, liquid

HOOC(CHOH)₂COOH CAS#: 87-69-4 F.W.: 150.09

N(CH₂CH₂OH)₃ CAS#: 102-71-6 F.W.: 149.19

N(CH₂CH₂OH)₃ CAS#: 102-71-6 F.W.: 149.19

TEST Suitability - Pass test Appearance - Clear, colorless solution Neutral solution 0 mV or pH 7 +/- 0.3 Made in accordance to ASTM D4739, section 7.15