Bilirubininterfereswith UricAcid DeterminationsInvolving

92 Cal) with cresolphthalein complexone 86 93 89 reagent, for possible future installation 76 92 86 in multi-channel continuous-flow anal71 88 84 yses. I slightlymodified a standard 66 85 76 SMA total calcium cartridge (Techni59 83 70 con Instruments Corp., Tarrytown, NY 51 81 65 10951) as in Figure 1. The sample was equilibrated to pH 7.40 with a small amount of Tris buffer, 400 mmol/L, and the nonprotein-bound calcium was dialyzed into Tris buffer of equivalent ionic strength, pH 7.40, in a standard Technicon 6-in, dialysis block.I used a Potassium ferrocyanide concentration 40 mol/L. 5The absorbances were correct for sampleblank. The uric acid concentration was 400 mol/L. Recoveries were slightly loweratloweruric acid concentrations.