P W Louwrier

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The acid dissociation constants of the metal chelates H(3)CuDTPA, H(2) NiDCTA, HCrEDTA, HCoHEEDTA, HNiHEEDTA and HCuHEEDTA were determined by potentiometric titration. The constants determined at an ionic strength of 0.1 were pK(a,1) = 2.1; pK(a,2) = 2.8 and pK(a,3) = 4.75 for H(3) CuDTPA (296 K), pK(a,1) = 2.16 for HCrEDTA (298 K); pK(a,1) = 1.6 and(More)
The formation of the ternary complexes CuEDTA(en)(2-), CuEDTA(CN)(3-), CuDCTA(CN)(3-), NiDCTA(CN)(3-) and NiEDTA(en)(2-) has been established spectrophotometrically. The stability constants found were log K = 2.87 +/- 0.03, 3.76 +/- 0.06, 2.64 +/- 0.35, 2.41 +/- 0.21 and 2.74 +/- 0.35 respectively. For the system CuDCTA(2-) + en no ternary complex was(More)
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