Humidity indicator for detecting crop leaf humidity and preparation method thereof
An indicator and humidity technology, which is used in material analysis by observing the influence of chemical indicators, and analysis by chemical reaction of materials, etc., can solve the lack of simple and quick basis for indication and judgment, and lack of systematic indication and quantification. , humidity judgment errors, etc., to maintain normal growth and development, high sensitivity, and low production costs
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[0021] Based on the same inventive concept, the present invention also provides a method for preparing a humidity indicator for detecting the humidity of crop leaves, which specifically includes the following steps:
[0022] Step 1, immerse 200-300 mesh silica gel in 2-10% ferric chloride solution by mass fraction (w / w) for 1-2h, drain the water, then transfer to 4-5% phenolphthalein Immerse in the solution for 1-2 hours to obtain the first impregnated silica gel, and finally dry the first impregnated silica gel until it completely loses moisture to obtain the first silica gel;
[0023] Step 2, immerse 200-300 mesh silica gel in a cobalt chloride solution with a mass fraction (w / w) of 2-10% for 1-2h, drain the water, and then transfer to a phenolphthalein solution with a mass fraction of 4-5% Immerse in the medium for 1-2h to obtain the second impregnated silica gel, and finally dry the second impregnated silica gel until it completely loses moisture to obtain the second silic...
Embodiment 1
[0029] A humidity indicator for detecting the humidity of crop leaves, consisting of the following components in mass percentage: 30% of the first silica gel, 40% of the second silica gel and 30% of the third silica gel; the first silica gel is the surface 200-mesh silica gel with ferric chloride and phenolphthalein adsorbed, the second silica gel is 200-mesh silica gel with cobalt chloride and phenolphthalein adsorbed on its surface, and the third silica gel is 200-mesh silica gel with sodium hydroxide adsorbed on its surface. Concretely prepare according to the following steps:
[0030] Step 1, immerse 200 mesh silica gel in 3.3% ferric chloride solution by mass fraction for 1 h, drain the water, then transfer to 4% phenolphthalein solution and dip for 1 h to obtain the first impregnated silica gel, and finally The first impregnated silica gel is dried to completely lose moisture to obtain the first silica gel;
[0031] Step 2, immerse 200 mesh silica gel in a cobalt chlori...
Embodiment 2
[0035] A humidity indicator for detecting the humidity of crop leaves, consisting of the following components by mass percentage: 20% of the first silica gel, 50% of the second silica gel and 30% of the third silica gel; the first silica gel is the surface 250-mesh silica gel with ferric chloride and phenolphthalein adsorbed, the second silica gel is 250-mesh silica gel with cobalt chloride and phenolphthalein adsorbed on its surface, and the third silica gel is 250-mesh silica gel with sodium hydroxide adsorbed on its surface. Concretely prepare according to the following steps:
[0036] Step 1, immerse 250 mesh silica gel in 5% ferric chloride solution by mass fraction for 2h, drain the water, then transfer to 5% phenolphthalein solution for 2h to obtain the first impregnated silica gel, and finally The first impregnated silica gel is dried to completely lose moisture to obtain the first silica gel;
[0037] Step 2, immerse 250 mesh silica gel in 5% cobalt chloride solution b...
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Abstract
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