FIELD: investigating or analyzing materials.
SUBSTANCE: indicator comprises filtering material made of two interconnected layers each of which is made of a mixture of ultra-thin perchlorovinyl fibers with a diameter of 5-9 μ and 0.5-1.2 μ. The first layer is provided with ferricyanide (II), and the second layer has a mixture of potassium ferricyanide (II) and potassium ferricyanide (III).
EFFECT: enhanced sensitivity.
23 cl
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