A spectrophotometric water quality automatic testing process

Abstract

The invention provides a water quality automatic testing flow by a spectrophotometry method, which comprises the following steps: sampling and extracting a sample with an assigned dosage by a metering unit, an oxidizing agent and other reagents for introducing the sample in order to a sample room, uniformly bubbling; measuring the light intensity output by a digest-colorimetric unit through the sample in the sample room before digestion; digesting the sample in the sample room; digesting the sample in a standing sample room; Different with a routine testing flow, after standing, uniformly rebubbling the digestion sample in the sample room; after uniformly bubbling, measuring the light intensity output by the digest-colorimetric unit through the sample room digestion sample before digestion; and calculating absorbance and concentration of a substrate to be measured in the sample. The water quality automatic testing flow is especially suitable for the water quality automatic testing occasion by the spectrophotometry method without developer participation in a color development reaction, and an oxidizing agent or a derivative of the oxidizing agent has coloration effect. The test result shows that the measure error can be reduced to 50% of original error level.

Description

technical field [0001] The invention relates to a spectrophotometric water quality automatic testing process, which is particularly suitable for the occasion of spectrophotometric water quality automatic testing without a color developing agent participating in the color reaction, and can be widely used in the technical field of water quality monitoring (or detection). Background technique [0002] In terms of automatic spectrophotometric water quality testing without chromogenic agent participating in color reaction (at this time, the oxidizing agent has both oxidation and color development), the current routine test steps are: [0003] 1. Inject the specified dose of water sample into the sample chamber; [0004] 2. Sequentially inject the specified doses of oxidants and other reagents into the sample chamber; [0005] 3. Measure the light intensity output by the light source through the sample chamber, and record it as the reference light intensity I parameter; [0006]...

AI Technical Summary

Problems solved by technology

[0009] In the traditional test process, after the sample is digested and left still, due to the uneven distribution of the concentration of the oxidant (or the conversion product of the oxidant) that did not participate in the reaction, the direct measurement of the colorimetric light intensity I ratio at this time will cause a large measurement error

Especially for oxidants (or conversion products of oxidants) with a large "molar absorptance ratio", the measurement error introduced by direct measurement will be quite large

[0010] Although the problem of uneven concentration distribution can be avoided by transferring the digested sample to another sample chamber for measurement (because the bubbling will be uniform again during the transfer process), additional loss is introduced due to sample flow and the chance of contamination is increased. , so the final measurement error will still be large, and increase the complexity of hardware setup and hardware cost

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