1,Introduction
Model BH4260 Methylene Blue Kit is used for testing the moving soil content by the method of MBT. Use the capacity of methylene blue can be estimated the total cation exchange capacity of solid phase which in the drilling fluid. The methylene blue test determines the capacity of clay to absorb cations from a solution, and thereby predict how the clay will react. Clay may be a component of a drilling fluid, a binder in
foundry sand, or a component in another application. This test is based on the property of clays known as cation-exchange capacity; clays can exchange some of their ions for the ions of certain other chemicals. The number of ions available for this exchange varies with different clays. For example, Western Bentonite, has more base exchange capacity than Southern Bentonite. However, only the reactive portions of clays are
involved in the cation exchange process. In this test, the clay particles are coated with methylene blue, giving them a distinct color until all ions available in the clay cation exchange process have been used. Excess methylene blue remains unaffected in solution around the particles and forms a blue-green tint that radiates from the darker spot, similar to a halo. Development of the halo shows that the total absorption
capacity of the clay has been reached, and is noted as the endpoint.
2 Safety
Safe laboratory practices and procedures should be observed while using the methylene blue kit. The chemicals in this kit may cause hazard to the user's health by direct contact, inhalation, or ingestion. Explosion and fire hazards may also exist
3 Features and Specifications
The instrument box is composed of box shell, the configuration in the box, etc., as shown in Figure3-1. The box is mainly equipped with closed electric furnace, plastic bottle, conical bottle, titration bottle, suction tube, triangle flask, tube brush, funnel, butterfly clip and so on.
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