An ultramicro-Kjeldahl technique

An Ultramicro Oxygen Electrode.

326-pg. 1964.-The advantages of a ~-p-diameter platinum cathode in the Clark-type o:xygen electrode are shown to be freedom from effects due to flow, stirring, or mechanical pressure. When used with a .5-mil polyethylene membrane the I-P electrode shows only a 2 ts difference between a vigorously stirred solution and the unstirred solution. A mechanical pressure of 200 psi on the I-P covered el...

Ultramicro determination of chloride.

A simple technique has been described by Wigglesworth (1937) for the determination of chloride in as little as 0-3 ,ul. of fluid. This is based on the Volhard titration and has been used in this Laboratory since 1947 for the examination of fish and crustacean blood. While the results obtained were satisfactory, the tedious back titration and the comparatively impermanent end point were found to...

An ultramicro method for the estimation of plasma cholesterol.

A procedure is outlined for the ultramicro determination of total cholesterol that gives results in excellent agreement with classic methods. The determination requires 40 l. of plasma obtained from a finger-tip puncture and special handling of precipitated proteins. By the use of the described procedure plasma cholesterol levels have been estimated 4 times daily over a period of 8 weeks in you...

Evaluation of Kjeldahl Digestion Method

The evaluation of the Kjeldahl digestion method was investigated by comparing measured values of total nitrogen, phosphorus and potassium using three salt and catalyst mixture in Standard Kjeldahl digestion method and Salicylic acid Modification method with certified values of plant material as well as comparison was made for determination of total nitrogen from steam distillation method verses...

A digestion rack for Kjeldahl flasks.