Fourthly Determination method

1. Carbon coefficient of fulvic acid

The traditional detection method of mineral source fulvic acid is mainly capacity method. Although this method is simple, it has many influencing factors and low accuracy. At the same time, the carbon coefficient of mineral source fulvic acid should be set. The carbon coefficient of fulvic acid applied now may not be able to truly reflect the actual carbon coefficient of mineral source under the new concept, so it is necessary to systematically study the determination method of the carbon coefficient of mineral source fulvic acid.

2. The universality of fulvic acid raw materials

The differential weight reduction method can be considered for humic acid raw materials, but it is a huge workload to verify the universality of the method for various types of humic acid raw materials.

3. Matrix interference of fulvic acid products

It is more difficult to detect the content of mineral source fulvic acid in fertilizer or other products containing humic acid. First of all, it is necessary to identify whether the mineral source fulvic acid, followed by the exclusion of more influential factors to separate and determine the mineral source fulvic acid, in the case of low content is difficult to use weight reduction method for determination, can only rely on capacity method or another way (such as: standard matter adsorption method, also known as weight gain method).