Engine performance and crankcase lubricant viscosity were followed with 1:2 and 1:1 fuel mixtures of degummed soybean oil in No. 2 diesel fuel in tests with a John Deere 6-cylinder, 404 cubic in. displacement, direct-injection, turbocharged engine for a total of 600 running hours. A crankcase oil contamination problem resulting in an unacceptable thickening and a potential for gelling did exist with a 50/50 blend or a greater concentration of soybean oil, but it did not occur with the 1:2 blend. The data accumulated during the initial 600 hr running time indicates that a fuel blend of one-third degurnmed soybean oil and two-thirds No. 2 diesel (1:2 blend) may be a suitable fuel for agricultural equipment during periods of diesel fuel shortages or allocations. Additional data are being accumulated and will be analyzed in the future.

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The objective of this study was to develop a specific analytic method for free residual chlorine with minimum sensitivity or, ideally, no response whatever to combined residual chlorine. The ability of the method to distinguish between the two forms of residual chlorine was particularly important, because in many cases both forms are present but only the free residual is effective as a disinfectant to assure that the water supply is safe. In addition, impurities interfere in one or more of the other methods for residual chlorine determinations. These include: dissolved oxygen, copper, nitrite, iron and manganese. As susceptibility to interferences of this kind seriously limits the application of any method under field conditions, their effect upon the p‐amino diethylaniline or N,N‐diethyl‐p‐phenylene diamine (DPD) method were evaluated as a part of this study.