Method for rapidly determining dissolved oxygen in water

Abstract

The invention discloses a method for rapidly determining dissolved oxygen in water. The method is characterized by using a water sampler, a test tube or colorimetric tube, reagents, a dropper and a dissolved oxygen reference card, wherein the water sampler comprises a soft bottle with a rubber stopper; the rubber stopper is provided with an air tube and a water tube; the air tube and the water tube are respectively provided with a valve card; the reagents include anhydrous manganese sulfate and alkaline potassium iodide; and the dissolved oxygen reference card is a standard color gradation card made according to the colors of the precipitates produced by reaction between the standard water sample containing different dissolved oxygen and the reagents. The method comprises the following steps: 1. taking a water sample; 2. fixing the water sample; and 3. determining the dissolved oxygen value of the water sample through colorimetry. The method has the following characteristics: the oxygen in the air can be avoided from being dissolved in the water sample by using the water sampler for acquiring water samples; and the color of the flocculent precipitate generated by the water sample is directly compared with the dissolved oxygen reference card and the method is simple, fast and applicable, the dissolved oxygen is measured immediately by using the method and the result is obtainedwithin 3-5 minutes, so the method has site guidance significance.

Description

technical field

[0001] The invention belongs to a method for measuring dissolved oxygen, in particular to a method for quickly measuring dissolved oxygen in water. Background technique

[0002] Dissolved oxygen is the basis for fish survival and is closely related to fish growth and reproduction. If dissolved oxygen is sufficient in water, fish will grow normally, but if dissolved oxygen in water is insufficient, fish will not grow even if fish have sufficient bait and are at the optimum growth temperature. , poor disease and stress resistance, if no technical measures to increase oxygen are taken, the fish will float, or even die in the pond, causing serious economic losses to aquaculture production.

[0003] Dissolved oxygen measurement is a key link in pond dissolved oxygen management and improvement of breeding benefits. At present, the dissolved oxygen measurement only stays in the laboratory and cannot be widely applied in the production site. There are two technical ...

Examples

Embodiment Construction

[0022] Rapid methods for the determination of dissolved oxygen in water include:

[0023] Use water collector, test tube or colorimetric tube, reagent, dropper and dissolved oxygen reference card; wherein, the water collector such as figure 1 As shown, it includes a soft bottle body 1 with a rubber stopper 2. The rubber stopper 2 is provided with an air pipe 6 and a water pipe 3, and the air pipe 6 and the water pipe 3 are respectively provided with valve cards 5 and 4; the concentration of the reagent is 300 g Anhydrous manganese sulfate of / L-400 g / L and alkaline potassium iodide whose concentration is 550g / L-650 g / L; the dissolved oxygen reference card 9 is based on the reaction of standard water samples with different dissolved oxygen amounts and reagents For a standard color scale chart made with precipitated colors, see image 3 ;

[0024] The steps are:

[0025] 1. Take water samples: figure 1 As shown, crush the bottle body 1, close the valve cards 5 and 4 on the a...

technical field

[0001] The invention belongs to a method for measuring dissolved oxygen, in particular to a method for quickly measuring dissolved oxygen in water. Background technique

[0002] Dissolved oxygen is the basis for fish survival and is closely related to fish growth and reproduction. If dissolved oxygen is sufficient in water, fish will grow normally, but if dissolved oxygen in water is insufficient, fish will not grow even if fish have sufficient bait and are at the optimum growth temperature. , poor disease and stress resistance, if no technical measures to increase oxygen are taken, the fish will float, or even die in the pond, causing serious economic losses to aquaculture production.

[0003] Dissolved oxygen measurement is a key link in pond dissolved oxygen management and improvement of breeding benefits. At present, the dissolved oxygen measurement only stays in the laboratory and cannot be widely applied in the production site. There are two technical ...

Examples

Embodiment Construction

[0022] Rapid methods for the determination of dissolved oxygen in water include:

[0023] Use water collector, test tube or colorimetric tube, reagent, dropper and dissolved oxygen reference card; wherein, the water collector such as figure 1 As shown, it includes a soft bottle body 1 with a rubber stopper 2. The rubber stopper 2 is provided with an air pipe 6 and a water pipe 3, and the air pipe 6 and the water pipe 3 are respectively provided with valve cards 5 and 4; the concentration of the reagent is 300 g Anhydrous manganese sulfate of / L-400 g / L and alkaline potassium iodide whose concentration is 550g / L-650 g / L; the dissolved oxygen reference card 9 is based on the reaction of standard water samples with different dissolved oxygen amounts and reagents For a standard color scale chart made with precipitated colors, see image 3 ;

[0024] The steps are:

[0025] 1. Take water samples: figure 1 As shown, crush the bottle body 1, close the valve cards 5 and 4 on the a...

Images