Total phosphorus turbidity compensation method applied to online monitoring of high-turbidity water body

Abstract

The invention discloses a total phosphorus turbidity compensation method applied to online monitoring of a high-turbidity water body. The method comprises the steps of correcting absorbance of turbidity at 700nm by taking colorimetric data of an actual water sample as a turbidity compensation parameter and combining dilution of a reagent to the water sample and a turbidity cardinal number of the water sample in an experimental method without establishing a turbidity marked line in advance; and deducting the total absorbance to obtain the absorbance contributed by the total phosphorus at 700nm,and finally calculating the total phosphorus concentration in the water sample. According to the algorithm, the influence of turbidity on total phosphorus detection can be greatly eliminated, the change condition of the total phosphorus content in a water environment can be accurately monitored, the algorithm is not restricted by a target monitoring place, the algorithm can adapt to water qualitychange, and an effective and reliable universality scheme is provided for online monitoring of total phosphorus.

Description

technical field [0001] The invention relates to the field of water area monitoring, in particular to a total phosphorus turbidity compensation method applied to online monitoring of high turbidity water bodies. Background technique [0002] Total phosphorus is the general term for orthophosphate, pyrophosphate, metaphosphate and organic phosphorus in water, and it is the main indicator of organic matter in water. An increase in the concentration of total phosphorus will cause algal blooms, eutrophication of the water body, algal blooms or red tides, and destroy the ecological balance of the water environment. Therefore, the national environmental protection department lists total phosphorus as one of the important monitoring indicators of water bodies. [0003] The composition of total phosphorus is complex and the properties of each component are unstable. Under the condition of high turbidity water, a large amount of total phosphorus will be adsorbed on the surface of imp...

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Problems solved by technology

But this method mainly has the following three problems: (1) adopt the turbidity standard substance (formazin) to establish the turbidity standard working curve, and formazin is a kind of chemical complex, and its characteristic can not fully represent the actual For impurity particles in water samples, the standard curve established by the laboratory cannot be fully applied to the actual water sample detection; (2) In practical applications, it is necessary to adjust the turbidity marking line according to the water quality characteristics of each target monitoring site, which greatly increases (3) When the water quality of the target monitoring site changes suddenly or the target monitoring site is changed, the particle size, adsorption, and refractive index of the impurity particles contained in the water body will change, and the algorithm model has only a small The probability can continue to apply, but manual adjustment of the marking lines and models is still required

[0005] In the prior art, "A Turbidity Compensation Method for Total Nitrogen and Total Phosphorus Analyzer" (Application No. 201810566626.7) tries to solve the above problems, but this patent only considers the dilution effect of reagents on water samples. For high turbidity For water samples (turbidity>300-500NTU, the middle and lower reaches of the Yellow River, Anhui, Yunnan and other places), the correction effect of this algorithm is very limited, and the upper limit of turbidity tolerance and water sample adaptive ability are still insufficient

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