The reasons for the non-linearity of the standard curve for the calcium-cresolphthalein complexone reaction have been investigated. Calcium forms both 1:1 and 2:1 complexes with cresolphthalein complexone; at low calcium concentrations the 1:1 complex predominates and causes non-linearity. At high calcium concentrations the cresolphthalein complexone concentration becomes limiting, resulting in flattening of the calibration curve. It is recommended that two-point calibration of the assay be performed using a low calcium standard rather than setting on the baseline.
Samwzary %C1 quadrupole resonance signals have been observed in eight salts of the HC1,-or DC1,-ion, all of which fall into two classes according as to whether the %C1 frequencies lie near 12 or 20 MHz: the results for CsCl,~(H,O+HCl,-) show that the low frequency signal is associated with a symmetric HC1,-ion, and the small shift observed on deuteriation can be explained in terms of a flat or nearly flat symmetric potential well.
Strong evidence is presented for generation of azetes by photolysis of fluorinated Ir2,3-triazine derivatives; a monocyclic azete has been trapped chemically and another has been observed at low temperature b y i.r. and mass spectroscopy.
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