CN109061091A - A method of estimation lake dissolved organic carbon concentration - Google Patents
A method of estimation lake dissolved organic carbon concentration Download PDFInfo
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- CN109061091A CN109061091A CN201811072505.3A CN201811072505A CN109061091A CN 109061091 A CN109061091 A CN 109061091A CN 201811072505 A CN201811072505 A CN 201811072505A CN 109061091 A CN109061091 A CN 109061091A
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Abstract
The invention discloses a kind of methods for estimating lake dissolved organic carbon concentration, include the following steps: S1, using the water salinity S in YSI water quality instrument on-site measurement lake, each sampling point in triplicate, records and calculates S measured value of the average value as the point；S2, lake DOC concentration: log (DOC)=0.52 × log (S)+1.11 is calculated according to drag.The method that the present invention passes through data Fitting Analysis is constructed the correlation of salinity S and the DOC concentration of lake actual measurement, is laid a good foundation for the detection of subsequent water body DOC concentration using measured data.The present invention can by field condition according to after water salinity value, in time, quickly, accurate estimation surface water body DOC concentration.
Description
Technical field
The present invention relates to Water Environment In Lakes to evaluate field, and in particular to a kind of side for estimating lake dissolved organic carbon concentration
Method.
Background technique
Carbon is one of the important element for constituting life entity, is the main body of entire biosphere matter and energy circulation.Carbon is certainly
Exist in the form of organic, inorganic or solid in right boundary, probably there is the carbon of 0.4-0.9Pg to flow into sea from land every year
Ocean, therefore land hydrosphere (such as lake, river) has very important effect earth water environment carbon cycle.In Lake Water
In the ecosystem, it is the Major Nutrient source of different oxygen animalcule, not only that dissolved organic carbon (DOC), which is that carbon is primarily present form,
There are coupled relations between other nutrients (nitrogen, phosphorus etc.), also influence ring by the conversion between dissolubility inorganic carbon (DIC)
The migration and degradation of border polluter.Therefore, carry out the correlative study of DOC concentration in water body in lake to analysis different type lake
Carbon cycle process and estimation water body in lake carbon source/remittance function be of great significance, for evaluate China's lake ecosystem carbon storage
The spatial and temporal patterns of amount provide scientific basis.
Currently, DOC concentration in the instruments analyzing water body such as total organic carbon analyzer is generallyd use both at home and abroad, in long-term practice
The needs of the research-on-researches such as the fast slowdown monitoring of the new period cannot be adapted to completely with discovery this method in research.Firstly, since instrument
Device is expensive, and common laboratory does not have the instrument；Secondly, apparatus measures need to take back water sampling laboratory progress, water sample
Holding time, storage temperature, the measurement accuracy of difference TOC instrument, gauger water sample pre-treatment operation etc., all can be to DOC
Measurement result affects greatly.Therefore, develop it is a kind of new, easily, the method for efficient measurement water body DOC concentration
As scientific researchers there is an urgent need to.
Summary of the invention
To solve the above problems, the present invention provides a kind of methods for estimating lake dissolved organic carbon concentration.
To achieve the above object, the technical scheme adopted by the invention is as follows:
A method of estimation lake dissolved organic carbon concentration includes the following steps:
S1, using the water salinity S in YSI water quality instrument on-site measurement lake, each sampling point in triplicate, records and calculates flat
S measured value of the mean value as the point；
S2, lake DOC concentration is calculated according to drag:
Log (DOC)=+ 1.11 (R of 0.52 × log (S)2=0.79, n=826, wherein R2Refer to this fit equation
Degree of fitting, n are sampled point quantity.
The model constructs by the following method:
A, 136 lakes and reservoir that are distributed in the whole nation are sampled, 6-8 sampling is arranged in each lake and reservoir
Point amounts to 1296 sampled points, and using YSI water quality instrument on-site measurement water salinity (S), measurement range 0-70ppt, precision is
0.01ppt, each sampling point in triplicate, record and calculate average value as the S measured value of the point；
B, surface water is acquired using hydrophore, each sampling point acquires 2L surface water body, and water depth 0.5-1m is placed in vehicle
Carry be transported in refrigerator laboratory be protected from light it is stored refrigerated, for 24 hours in measure its dissolved organic matter (DOC) concentration, when measurement, by water
Sample cryo-conservation after the filtering of the glass fiber filter in 0.45 μm of aperture, is made to refer to water sample with ultrapure water, measures the total of filtered fluid
Carbon (DTC) concentration and dissolubility inorganic carbon (DIC) concentration are dissolved, DOC concentration is the difference that DTC subtracts DIC；DTC and DIC concentration
Measurement uses 680 DEG C of high-temperature S removal methods, carries out on TOC analyzer, and this method detection is limited to 0.3mg/L, each water sample
It is repeated three times, records and calculates average value as the measured value of the point；
C, the salinity S and DOC using 2017 software of Microsoft Excel to the 106 lakes actual measurement for being distributed in the whole nation
Concentration value carries out correlation Fitting Analysis to get the model.
The invention has the following advantages:
1) method for passing through data Fitting Analysis constructs salinity S and the DOC concentration of lake actual measurement using measured data
Correlation, lay a good foundation for the detection of subsequent water body DOC concentration.
It 2) can be by the way that after field condition is according to water salinity value, in time, quickly, accurately estimation surface water body DOC be dense
Degree.
Detailed description of the invention
Fig. 1 is sampling lake distribution map.
Fig. 2 is the correlation analysis figure of the salinity S of dissolved organic carbon (DOC) concentration and lake actual measurement.
Fig. 3 is that lake dissolved organic carbon (DOC) concentration carried out based on the present invention estimates schematic diagram.
Fig. 4 is DOC measured value and the DOC concentration value correlation analysis calculated according to this patent method.
Specific embodiment
The present invention is described in detail combined with specific embodiments below.Following embodiment will be helpful to the technology of this field
Personnel further understand the present invention, but the invention is not limited in any way.It should be pointed out that the ordinary skill of this field
For personnel, without departing from the inventive concept of the premise, various modifications and improvements can be made.These belong to the present invention
Protection scope.
The method that the present invention passes through data Fitting Analysis constructs the salinity S and DOC of lake actual measurement using measured data
The correlation of concentration, specific:
Step 1: sampling to 136 lakes and reservoir that are distributed in the whole nation, distribution map is as shown in Figure 1, each lake
6-8 sampled point is set with reservoir, amounts to 1296 sampled points, uses YSI water quality instrument on-site measurement water salinity (S), measurement
Range is 0-70ppt, and precision 0.01ppt, in triplicate, the S for recording and calculating average value as the point is surveyed each sampling point
Value；
Step 2: using hydrophore acquisition surface water, each sampling point acquisition 2L surface water body, water depth 0.5-1m,
Be placed in car refrigerator be transported to laboratory be protected from light it is stored refrigerated, for 24 hours in measure its dissolved organic matter (DOC) concentration, measurement
When, by water sample after the filtering of the glass fiber filter (Chinese peninsula Industrial Co., Ltd) in 0.45 μm of aperture cryo-conservation, with super
Pure water is made to refer to water sample, and total dissolution carbon (DTC) concentration and dissolubility inorganic carbon (DIC) concentration, DOC concentration for measuring filtered fluid are
DTC subtracts the difference of DIC；DTC and DIC concentration mensuration uses high-temperature S removal method (680 DEG C), in TOC analyzer (TOC-
VCPN, Japanese Shimadzu Corporation) on carry out, this method detection be limited to 0.3mg/L, each water sample is repeated three times, and is recorded and is counted
Average value is calculated as the measured value of the point；
Step 3: the salinity S using 2017 software of Microsoft Excel to the 106 lakes actual measurement for being distributed in the whole nation
Correlation Fitting Analysis is carried out with DOC concentration value (totally 826 sampling points), is obtained with drag:
Log (DOC)=+ 1.11 (R of 0.52 × log (S)2=0.79, n=826, wherein R2Refer to this fit equation
Degree of fitting, n are sampled point quantity).
Based on above-mentioned model, the embodiment of the invention provides a kind of method for estimating lake dissolved organic carbon concentration, packets
Include following steps:
S1, using the water salinity S in YSI water quality instrument on-site measurement lake, each sampling point in triplicate, records and calculates flat
S measured value of the mean value as the point；
S2, DOC concentration in lake is calculated according to the model:
Inventor carries out the estimation of DOC concentration to 80 lakes for being distributed in the whole nation using this method, amounts to 470 samplings
Point, as a result such as Fig. 3,40.17% sampled point DOC concentration value is 1-5mg/L, and 32.01% sampled point DOC concentration value is in 0-
1mg/L, 16.53% sampled point SDD value are at 5-10mg/L, and 6.90% sampled point SDD value is at 10-
20mg/L, the sampled point DOC concentration value of residue 4.40% are 20-70mg/L.
In order to verify the accuracy of the estimation result, this research is simultaneously using the TOC analysis-e/or determining DOC in this 80 lake
These DOC measured values are fitted analysis with the DOC concentration value calculated according to this patent method, realize mould by concentration value
Type precision test (Fig. 4), the results showed that average absolute percentage error (MAPE) is only 33.60%, is calculated according to this patent method
DOC concentration value out and actual measurement DOC concentration value and ratio be 0.95, correlation precision is preferable, according to this patent method meter
The DOC calculated confidence level with higher.
Specific embodiments of the present invention are described above.It is to be appreciated that the invention is not limited to above-mentioned
Particular implementation, those skilled in the art can make a variety of changes or modify within the scope of the claims, this not shadow
Ring substantive content of the invention.In the absence of conflict, the feature in embodiments herein and embodiment can any phase
Mutually combination.
Claims (2)
1. a kind of method for estimating lake dissolved organic carbon concentration, characterized by the following steps:
S1, using the water salinity S in YSI water quality instrument on-site measurement lake, each sampling point in triplicate, records and calculates average value
S measured value as the point；
S2, lake DOC concentration is calculated according to drag:
Log (DOC concentration)=0.52 × log (S)+1.11.
2. a kind of method for estimating lake dissolved organic carbon concentration as described in claim 1, it is characterised in that: the model
It constructs by the following method:
A, 136 lakes and reservoir that are distributed in the whole nation are sampled, 6-8 sampled point is arranged in each lake and reservoir, altogether
1296 sampled points are counted, using YSI water quality instrument on-site measurement water salinity S, measurement range 0-70ppt, precision is
0.01ppt, each sampling point in triplicate, record and calculate average value as the S measured value of the point；
B, surface water is acquired using hydrophore, each sampling point acquires 2L surface water body, and water depth 0.5-1m is placed in vehicle-mounted ice
Be transported in case laboratory be protected from light it is stored refrigerated, for 24 hours in measure its dissolved organic matter (DOC) concentration, when measurement, water sample is passed through
Cryo-conservation after the glass fiber filter filtering in 0.45 μm of aperture, is made to refer to water sample with ultrapure water, measures total dissolution of filtered fluid
Carbon (DTC) concentration and dissolubility inorganic carbon (DIC) concentration, DOC concentration are the difference that DTC subtracts DIC；DTC and DIC concentration mensuration
It using 680 DEG C of high-temperature S removal methods, is carried out on TOC analyzer, this method detection is limited to 0.3mg/L, and each water sample repeats
Measurement three times, records and calculates average value as the measured value of the point；
C, salinity S and the DOC concentration using 2017 software of Microsoft Excel to the 106 lakes actual measurement for being distributed in the whole nation
Value carries out correlation Fitting Analysis to get the model.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109709296A (en) * | 2019-02-21 | 2019-05-03 | 南通大学 | A method of quickly suspended state cadmium concentration in continuous estimation water |
| CN112305149A (en) * | 2020-07-29 | 2021-02-02 | 中国科学院东北地理与农业生态研究所 | Method for estimating water solubility inorganic carbon concentration |
| CN112485399A (en) * | 2020-12-18 | 2021-03-12 | 江南大学 | Sewage toxin concentration estimation method |
| CN114444253A (en) * | 2021-11-26 | 2022-05-06 | 中林信达（北京）科技信息有限责任公司 | Method for estimating partial pressure of carbon dioxide in lake water body |
| CN115166190A (en) * | 2022-08-26 | 2022-10-11 | 中国长江三峡集团有限公司 | River dissolved organic carbon flux detection method and device and electronic equipment |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109709296A (en) * | 2019-02-21 | 2019-05-03 | 南通大学 | A method of quickly suspended state cadmium concentration in continuous estimation water |
| CN112305149A (en) * | 2020-07-29 | 2021-02-02 | 中国科学院东北地理与农业生态研究所 | Method for estimating water solubility inorganic carbon concentration |
| CN112305149B (en) * | 2020-07-29 | 2022-10-28 | 中国科学院东北地理与农业生态研究所 | Method for estimating water solubility inorganic carbon concentration |
| CN112485399A (en) * | 2020-12-18 | 2021-03-12 | 江南大学 | Sewage toxin concentration estimation method |
| CN112485399B (en) * | 2020-12-18 | 2021-09-07 | 江南大学 | Sewage toxin concentration estimation method |
| CN114444253A (en) * | 2021-11-26 | 2022-05-06 | 中林信达（北京）科技信息有限责任公司 | Method for estimating partial pressure of carbon dioxide in lake water body |
| CN115166190A (en) * | 2022-08-26 | 2022-10-11 | 中国长江三峡集团有限公司 | River dissolved organic carbon flux detection method and device and electronic equipment |
| CN115166190B (en) * | 2022-08-26 | 2024-02-09 | 中国长江三峡集团有限公司 | River dissolved organic carbon flux detection method and device and electronic equipment |
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