At present, there are many domestic methods for determining the acid value of oil products, which are mainly divided into indicator method and potentiometric titration method. The indicator method is represented by GB / T264, but the accuracy is often affected, which is not suitable for dark oil products and Determination of viscous oil products; Potentiometric titration method is represented by GB / T7304. The oil products have wide adaptability and the endpoint determination is more objective, which represents the future development direction of oil acid value determination. However, this method has the defects that a large amount of toluene solvent is used, the potential jump of some oil products is small, and the toxicity needs to be used. The preparation of cumbersome m-nitrophenol assists in the determination of the end point. This paper proposes an improved method for determining the acid value of oil products by the GB / T7304 method. In this method, the KOH solution of the titrant is changed to the organic alkali titrant tetramethylammonium hydroxide, and the toxic reagent toluene in the titration solvent is changed to a non-toxic petroleum ether combined with a small amount of alcohol amine alkaline reagent. Leap, eliminating the preparation of m-nitrophenol non-aqueous solution used to assist in indicating the end point, further improving the accuracy of the method, the oil acid value above 0.005mg (KOH) / g can be measured, and the relative standard deviation of the results is not More than 3.0%, less than 6.0% of the standard method. The method has been applied in daily work and the results are satisfactory.
Cutting boards are arguably one of the most important tools in your kitchen - it's near impossible to cook without one.
There are four reasons why use a Cutting Board as below:
1.Cutting boards protect your expensive counter top from damage resulting from the sharp edge of the kitchen knife.
2.They also protect the edge of the knife from damage from the counter top (at least in the example of a wood cutting board.
3.They can be used to handily move the chopped or cut food to a skillet or pot, keeping most of the mess in a small easy to clean area.
4.They can be easily cleaned and disinfected in the kitchen sink.
It is a very good idea to have more than one board, one exclusively for vegetables and one specifically for meats. Two boards help prevent cross contamination of the raw meat preparation with the vegetables and salad. Two cutting boards is one more way to keep the meal safe from bacterial contamination.
The one universally agreed upon method of cleaning and sanitizing both wood and plastic boards is as follows. First a thorough scrubbing with warm soapy water - be sure to remove all food particles, oils, grease, and residue. Secondly a mixture of water and bleach solution (one tablespoon of liquid chlorine bleach in one gallon of water) to completely disinfect the surface area all around. Thirdly and importantly let the board completely dry.
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