IL gives you fits And on purpose, too! We make a thin combination pH electrode that fits just about any where there is a measurement to be made. In addition its rugged flat tip provides quick pH determi nations in micro-titration vessels, petri dishes or even oh a wet surface. A half drop provides more sample than is needed. It is the IL 14043 micro-electrode. ; ^ ^ Just one of many eom-. ^ B bination electrodes \^^L· available from / ^ K : Instrumentation , "'• ^ ^ H : Laboratory. ^^Hj
INSTRUMENTATION
Better results can be obtained by the combination of measured values from different plates than by the combined values obtained from one plate. Mobile Phase. A change in the sta tionary and mobile phase used for the separation affects the shape and size of the separated component. Different systems offer different rates of move ments depending on the adsorption iso therm and (or) the partition coeffi cients of the component with respect to the solvent system. The solvent sys tem that permits a low ~Rf usually gives a small, round compact spot. Systems that result in high Hf of the compound usually offer larger, often elongated and sometimes laterally diffuse spots. The changes in size and shape are reflected in a different distribution and deposi tion of compound on the adsorbent. Of importance is that the same quantity of substance may give a different re sponse with regard to the densitometer readings after separation utilizing dif ferent solvent systems. Instruments
Interested?An # Jiy'i p f •%. ' eight page bro- #: J * { {Μ °'Ά :: ctiure tells the # I r : : M %;: complete IL C .JS' j j l W pH story: J J 1» "'*' electrodes, •« ...Jiisi.. t . t: :,...,, meters, ,.. ^βϊ|||)§& ^ :;·υ,: : accessories '.!:vt; :,, ; T,:i'nm^i^^A^ and supplies, : ; : j :K"i' H; : iS5«r*^^ Send today for your copy. What ever your need IL has the pH equipment that fits. P.S. All IL pH electrodes (and our 83020 MULTMiex™ Electrode Arm, too) can be used with any pH meter. No need to wait. Just tell us the model you are using.
Instrumentation Laboratory Inc. 113 Hartwell Avenue Lexington, Massachusetts 02173
The Nester-Faust TJniscan 900 (Nester-Faust Manufacturing Corp., Newark, Del.) utilizes the illumination and detection geometry used for many years in measuring colored solids and surfaces. The chromatogram is il luminated at a 45° angle to the sur face of the plate by an incandescent source and then scanned at 90° to the surface. Two methods of operation are
