Abstract: A method for producing an amino acid liquid fertilizer from waste feathers includes: acquiring an enzymatic hydrolysate by performing enzymolysis on feather powder with a complex enzyme; adding acid protease to the enzymatic hydrolysate for enzymolysis; and acquiring the amino acid liquid fertilizer by performing enzyme inactivation on a filtrate acquired by performing filtering after enzymolysis is completed, wherein the complex enzyme includes keratinase and amino acid peptidase. By adopting this method, the enzymolysis rate of the feathers reaches 80% or above and the prepared amino acid liquid fertilizer contains various kinds of amino acids (17 amino acids); and the content of the amino acid can reach 10.12% (by mass fraction) or above and the content of small peptide reaches 9.39% (by mass fraction), which reach the Chinese standard of the amino acid liquid fertilizers without concentration. Thus, the environmental-friendly amino acid liquid fertilizer can be prepared.

Abstract: A method for producing an amino acid liquid fertilizer from waste feathers includes: acquiring an enzymatic hydrolysate by performing enzymolysis on feather powder with a complex enzyme; adding acid protease to the enzymatic hydrolysate for enzymolysis; and acquiring the amino acid liquid fertilizer by performing enzyme inactivation on a filtrate acquired by performing filtering after enzymolysis is completed, wherein the complex enzyme includes keratinase and amino acid peptidase. By adopting this method, the enzymolysis rate of the feathers reaches 80% or above and the prepared amino acid liquid fertilizer contains various kinds of amino acids (17 amino acids); and the content of the amino acid can reach 10.12% (by mass fraction) or above and the content of small peptide reaches 9.39% (by mass fraction), which reach the Chinese standard of the amino acid liquid fertilizers without concentration. Thus, the environmental-friendly amino acid liquid fertilizer can be prepared.

Abstract: A cleaning equipment of sample bottle for chromatography analysis comprising: a base; a support frame vertically fixed to the base; a horizontal column having two ends, wherein one of the ends is disposed at the support frame through an adjustment knob; a rotary drive device fixed to the other end of the horizontal columns; a rotation disk which can rotate through driving of the rotary drive device, and a side edge of the rotation disk provides with multiple placing holes for receiving and fixing sample bottles; a cleaning agent recycling tank disposed below the rotation disk, wherein a side wall of it provides with an ejector pipe connected with a water pump; and a control unit for controlling on/off and rotation speed of the rotary drive device, and on/off of the water pump. The invention also provides a cleaning method of sample bottle for chromatography analysis.

Abstract: The present application relates to a colorimeter measurement method and a colorimeter for implementing the method. The method includes the following steps: placing a measured sample on a sample platform; shooting a current image of the sample; determining an intersection angle ? between the sample and a moving direction of the sample platform; adjusting a position of a scanning light spot of a colorimeter according to the angle ?, so that the sample coincides with the moving direction of the sample platform; using the colorimeter to scan the measured sample. By implementing the colorimeter measurement method and the colorimeter of the present application, the sample can be placed optionally when it is measured. Specially, when a design value of a measured sample is approximately equal to a size of the measuring light spot, much time can be saved and manpower waste is avoided.

Abstract: The present application relates to a colorimeter measurement method and a colorimeter for implementing the method. The method includes the following steps: placing a measured sample on a sample platform; shooting a current image of the sample; determining an intersection angle ? between the sample and a moving direction of the sample platform; adjusting a position of a scanning light spot of a colorimeter according to the angle ?, so that the sample coincides with the moving direction of the sample platform; using the colorimeter to scan the measured sample. By implementing the colorimeter measurement method and the colorimeter of the present application, the sample can be placed optionally when it is measured. Specially, when a design value of a measured sample is approximately equal to a size of the measuring light spot, much time can be saved and manpower waste is avoided.

Abstract: The present invention provides a potentiometric titration method for measuring concentration of acid mixture of aluminum etchant, which prepares identified potassium hydroxide-ethanol solution or sodium hydroxide-ethanol solution as a titrant and uses a monohydric alcohol and a diol as an anhydrous medium for the acid mixture of aluminum etchant to carry out titration of the acid mixture of aluminum etchant so as to realize measurement of concentration of each acid contained in the acid mixture of aluminum etchant through a one-stage process of potentiometric titration thereby reducing the complication of operation of inspection and uncertainty of inspection result and achieving the purposes of carrying out inspections with high precision and high performance. The method can efficiently and accurately measure the concentrations of nitric acid, phosphoric acid, and acetic acid contained in the acid mixture of aluminum etchant.

Abstract: A cleaning equipment of sample bottle for chromatography analysis comprising: a base; a support frame vertically fixed to the base; a horizontal column having two ends, wherein one of the ends is disposed at the support frame through an adjustment knob; a rotary drive device fixed to the other end of the horizontal columns; a rotation disk which can rotate through driving of the rotary drive device, and a side edge of the rotation disk provides with multiple placing holes for receiving and fixing sample bottles; a cleaning agent recycling tank disposed below the rotation disk, wherein a side wall of it provides with an ejector pipe connected with a water pump; and a control unit for controlling on/off and rotation speed of the rotary drive device, and on/off of the water pump. The invention also provides a cleaning method of sample bottle for chromatography analysis.

Abstract: The present invention provides a potentiometric titration method for measuring concentration of acid mixture of aluminum etchant, which prepares identified potassium hydroxide-ethanol solution or sodium hydroxide-ethanol solution as a titrant and uses a monohydric alcohol and a diol as an anhydrous medium for the acid mixture of aluminum etchant to carry out titration of the acid mixture of aluminum etchant so as to realize measurement of concentration of each acid contained in the acid mixture of aluminum etchant through a one-stage process of potentiometric titration thereby reducing the complication of operation of inspection and uncertainty of inspection result and achieving the purposes of carrying out inspections with high precision and high performance. The method can efficiently and accurately measure the concentrations of nitric acid, phosphoric acid, and acetic acid contained in the acid mixture of aluminum etchant.