CN109459526A - The detection method of field emergency Drinking Water hardness - Google Patents
The detection method of field emergency Drinking Water hardness Download PDFInfo
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- CN109459526A CN109459526A CN201811564383.XA CN201811564383A CN109459526A CN 109459526 A CN109459526 A CN 109459526A CN 201811564383 A CN201811564383 A CN 201811564383A CN 109459526 A CN109459526 A CN 109459526A
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- 238000001514 detection method Methods 0.000 title claims abstract description 50
- 239000003651 drinking water Substances 0.000 title claims abstract description 26
- 235000020188 drinking water Nutrition 0.000 title claims abstract description 26
- KCXVZYZYPLLWCC-UHFFFAOYSA-N EDTA Chemical compound OC(=O)CN(CC(O)=O)CCN(CC(O)=O)CC(O)=O KCXVZYZYPLLWCC-UHFFFAOYSA-N 0.000 claims abstract description 57
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 55
- 239000003153 chemical reaction reagent Substances 0.000 claims abstract description 35
- 239000012086 standard solution Substances 0.000 claims abstract description 31
- 238000000034 method Methods 0.000 claims abstract description 24
- 238000001802 infusion Methods 0.000 claims abstract description 23
- 238000004448 titration Methods 0.000 claims description 17
- 239000003109 Disodium ethylene diamine tetraacetate Substances 0.000 claims description 16
- 235000019301 disodium ethylene diamine tetraacetate Nutrition 0.000 claims description 16
- 238000005303 weighing Methods 0.000 claims description 14
- VTYYLEPIZMXCLO-UHFFFAOYSA-L calcium carbonate Substances [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 9
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 8
- 239000004698 Polyethylene Substances 0.000 claims description 5
- -1 polyethylene Polymers 0.000 claims description 5
- 229920000573 polyethylene Polymers 0.000 claims description 5
- 239000002699 waste material Substances 0.000 abstract description 4
- 239000000243 solution Substances 0.000 description 11
- 238000002474 experimental method Methods 0.000 description 5
- 239000000047 product Substances 0.000 description 4
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 3
- JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-UHFFFAOYSA-N 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 3
- 239000011575 calcium Substances 0.000 description 3
- 229910001424 calcium ion Inorganic materials 0.000 description 3
- 229910001425 magnesium ion Inorganic materials 0.000 description 3
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 2
- 239000002384 drinking water standard Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 230000010412 perfusion Effects 0.000 description 2
- 238000010561 standard procedure Methods 0.000 description 2
- QXNVGIXVLWOKEQ-UHFFFAOYSA-N Disodium Chemical compound [Na][Na] QXNVGIXVLWOKEQ-UHFFFAOYSA-N 0.000 description 1
- 150000001412 amines Chemical class 0.000 description 1
- 238000003556 assay Methods 0.000 description 1
- 125000005587 carbonate group Chemical group 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 230000035800 maturation Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N31/00—Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted for such methods
- G01N31/16—Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted for such methods using titration
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N5/00—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid
Abstract
The invention discloses a kind of detection methods of field emergency Drinking Water hardness, comprising steps of drawing the water sample of 1.00mL, its quality of scale is denoted as m1；1.00mLEDTA standard solution is drawn again, its quality of scale is calculated as m2；150mL Erlenmeyer flask is placed on balance and allowances for bark clearing, into Erlenmeyer flask plus 50.00g or the above water, its quality of scale are calculated as m3；Various other reagents in addition to EDTA are added, its quality of scale is calculated as m4；EDTA standard solution is dripped to Erlenmeyer flask with infusion apparatus, after being titrated to terminal, its quality of scale is calculated as m5；A certain amount of pure water is taken, various other reagents in addition to EDTA are added, is placed on balance and allowances for bark clearing, EDTA standard solution is dripped to Erlenmeyer flask with infusion apparatus, after being titrated to terminal, its quality of scale is calculated as m6；Calculate the total hardness of water.This method detects timeliness and accuracy is high, and reagent waste is few, can avoid carrying frangible glassware.
Description
Technical field
The present invention relates to Drinking Water health detection technique fields, and in particular to a kind of field emergency Drinking Water is hard
The detection method of degree.
Background technique
Water hardness is an important monitoring index of water quality, and water hardness is excessively high, can to human health, daily life,
The generations such as industrial production harm.The total hardness of water refers to the total concentration of calcium and magnesium ion in water, (i.e. logical including carbonate hardness
Cross the calcium and magnesium ion that can precipitate with carbonate form of heating, therefore be called temporary hardness) and non-carbonate hardness (heat
The part calcium and magnesium ion that cannot be precipitated afterwards, also known as permanent hardness).It is existing detection the water hardness method mainly according to
According to the disodium ethylene diamine tetraacetate titration in " drinking water standard method of inspection " GB/T5750.6-2006, in detection process
Needing equipment to be used includes: that 150mL conical flask, 25mL or 50mL buret, 50.00mL tripe type suction pipe and various scales are inhaled
Pipe.Although the existing technology maturation, device therefor are glassware, it is easily broken, not readily portable and field operation；
And special assay laboratory and specialty analysis laboratory personnel are needed, cannot achieve field quick detection.Therefore, it is also desirable to
Exploitation is suitable for the detection method of field emergency Drinking Water hardness.
Summary of the invention
For the defects in the prior art, the present invention provides a kind of detection method of field emergency Drinking Water hardness,
This method detects timeliness height, accuracy height, and reagent waste is few, saves resource, and vierics that can be frangible to avoid carrying
Ware.
To achieve the above object, technical solution provided by the invention are as follows:
The present invention provides a kind of detection methods of field emergency Drinking Water hardness, comprising steps of drawing 1.00mL
Water sample, its quality of scale, is denoted as m1；1.00mLEDTA standard solution is drawn again, its quality of scale is calculated as m2；150mL Erlenmeyer flask is put
Allowance for bark clearing in balance, then into Erlenmeyer flask plus 50.00g or more than water, its quality of scale is calculated as m3；GB/T5750.6- is pressed again
Regulation in 2006 disodium ethylene diamine tetraacetate titrations is added various other reagents in addition to EDTA, then scale its quality, is calculated as
m4；EDTA standard solution is dripped to Erlenmeyer flask with infusion apparatus again, after being titrated to terminal, then scale its quality, it is calculated as m5；It takes a certain amount of
Pure water, be added by the regulation in GB/T5750.6-2006 disodium ethylene diamine tetraacetate titration other each in addition to EDTA
Kind reagent, is placed on balance and allowances for bark clearing, then EDTA standard solution is dripped to Erlenmeyer flask with infusion apparatus, after being titrated to terminal, then
Its quality of scale, is calculated as m6；Calculate the total hardness of water.
Preferably, the total hardness of water is with CaCO3Meter.The total hardness of water is calculated as follows: ρ (CaCO3)=(V1-V0)*c*
100.09*1000/V unit mg/L；Wherein, V1=(m5-m4)/m2, unit mL；V=m3/m1, unit mL；V0=m6/
m2, unit mL；C is the concentration of EDTA standard solution, unit mol/L.
Preferably, m is measured4When allowance for bark clearing, m at this time4It is calculated as 0.
Preferably, the reagent used in detection process is prepared in advance and is stored in polyethylene bottle, is carried to field.It needs
It is noted that the preparation of reagents that the present invention uses is the same as second two in " drinking water standard method of inspection " GB/T5750.6-2006
Regulation in amine tetraacethyl disodium titration.
Preferably, the reagent used in detection process is the finished product reagent of purchase, is carried to field.
Preferably, the equipment used in detection process includes: the portable electronic that 1 maximum weighing range is 200.00g
Balance, 1 150mL conical flask, 1 1-10mL liquid-transfering gun, 1 branch infusion tube.
It is further preferred that portable electronic balance can accurate weighing to 0.01g.
Technical solution provided by the invention, with following the utility model has the advantages that (1) Drinking Water hardness provided by the invention
Detection method, can solve certainly that existing method device therefor is easily broken to avoid frangible glassware is carried, be not easy to
The problem of carrying and field operation；(2) detection method of Drinking Water hardness provided by the invention carries out detection at the scene and mentions
The timeliness of height experiment；EDTA can do the final mean annual increment solution with perfusion tube directly use (closed container solution concentration variation it is small, mention
The accuracy of height experiment)；Reagent waste is few, saves resource；(3) detection method of Drinking Water hardness provided by the invention is suitable
Capacity analysis project for all water quality.
Additional aspect and advantage of the invention will be set forth in part in the description, and will partially become from the following description
Obviously, or practice through the invention is recognized.
Specific embodiment
Below in conjunction with the embodiment of the present invention, technical solution of the present invention is clearly and completely described.Implement below
Example is only used for clearly illustrating technical solution of the present invention, therefore is intended only as example, and cannot be used as a limitation and limit this hair
Bright protection scope.
Experimental method in following embodiments is unless otherwise specified conventional method.Quantitative examination in following embodiment
It tests, is respectively provided with three repeated experiments, data are the average value or mean+SD of three repeated experiments.
The present invention provides a kind of detection method of field emergency Drinking Water hardness, comprising steps of
1.00mL water sample is drawn, its quality of scale is denoted as m1；1.00mLEDTA standard solution is drawn again, its quality of scale is calculated as
m2；
150mL Erlenmeyer flask is placed on balance and allowances for bark clearing, then into Erlenmeyer flask plus 50.00g or more than water, its matter of scale
Amount, is calculated as m3；It is added again by the regulation in GB/T5750.6-2006 disodium ethylene diamine tetraacetate titration other in addition to EDTA
Various reagents, then scale its quality, are calculated as m4, or allowance for bark clearing；EDTA standard solution is dripped to Erlenmeyer flask with infusion apparatus again, is titrated
To after terminal, then scale its quality, it is calculated as m5；
A certain amount of pure water is taken, is added by the regulation in GB/T5750.6-2006 disodium ethylene diamine tetraacetate titration
Various other reagents in addition to EDTA are placed on balance and allowance for bark clearing, then EDTA standard solution is dripped to Erlenmeyer flask with infusion apparatus,
After being titrated to terminal, then scale its quality, it is calculated as m6；
The total hardness of water is calculated (with CaCO3Meter), the total hardness of water is calculated as follows:
ρ(CaCO3)=(V1-V0) * c*100.09*1000/V, unit mg/L；
Wherein,
V1=(m5-m4)/m2, unit mL；Measure m4When allowance for bark clearing, m at this time4It is calculated as 0；
V=m3/m1, unit mL；
V0=m6/m2, unit mL；
C is the concentration of EDTA standard solution, unit mol/L.
The reagent used in detection process of the present invention is prepared in advance and is stored in polyethylene bottle, or be purchase at
Product reagent is carried to field.
It is 200.00g and can accurate weighing that the equipment used in detection process of the present invention, which includes: 1 maximum weighing range,
To the portable electronic balance of 0.01g, 1 150mL conical flask, 1 1-10mL liquid-transfering gun, 1 branch infusion tube.
Combined with specific embodiments below to the detection method of field emergency Drinking Water hardness provided by the invention make into
One step explanation.
Embodiment 1
The present embodiment provides a kind of detection methods of field emergency Drinking Water hardness, comprising steps of
1.00mL water sample is drawn, its quality of scale is denoted as m1；1.00mLEDTA standard solution is drawn again, its quality of scale is calculated as
m2；
150mL Erlenmeyer flask is placed on balance and allowances for bark clearing, then adds the water of 50.00g or more into Erlenmeyer flask, its quality of scale,
It is calculated as m3；It is added again by the regulation in GB/T5750.6-2006 disodium ethylene diamine tetraacetate titration other each in addition to EDTA
Kind of reagent, then scale its quality, are calculated as m4；EDTA standard solution is dripped to Erlenmeyer flask with infusion apparatus again, after being titrated to terminal, then scale
Its quality, is calculated as m5；
A certain amount of pure water is taken, is added by the regulation in GB/T5750.6-2006 disodium ethylene diamine tetraacetate titration
Various other reagents in addition to EDTA are placed on balance and allowance for bark clearing, then EDTA standard solution is dripped to Erlenmeyer flask with infusion apparatus,
After being titrated to terminal, then scale its quality, it is calculated as m6；
The total hardness of water is calculated as follows (with CaCO3Meter):
ρ(CaCO3)=(V1-V0) * c*100.09*1000/V, unit mg/L；
Wherein,
V1=(m5-m4)/m2, unit mL；
V=m3/m1, unit mL；
V0=m6/m2, unit mL；
C is the concentration of EDTA standard solution, unit mol/L.
The reagent used in detection process of the present invention is prepared in advance and is stored in polyethylene bottle, is carried to field.
It is 200.00g and can accurate weighing that the equipment used in detection process of the present invention, which includes: 1 maximum weighing range,
To the portable electronic balance of 0.01g, 1 150mL conical flask, 1 1-10mL liquid-transfering gun, 1 branch infusion tube.
Embodiment 2
The present embodiment provides a kind of detection methods of field emergency Drinking Water hardness, comprising steps of
1.00mL water sample is drawn, its quality of scale is denoted as m1；1.00mLEDTA standard solution is drawn again, its quality of scale is calculated as
m2；
150mL Erlenmeyer flask is placed on balance and allowances for bark clearing, then adds the water of 50.00g or more into Erlenmeyer flask, its quality of scale,
It is calculated as m3；It is added again by the regulation in GB/T5750.6-2006 disodium ethylene diamine tetraacetate titration other each in addition to EDTA
Kind of reagent, then scale its quality, allowance for bark clearing, are calculated as m4(m4It is calculated as 0)；EDTA standard solution is dripped to Erlenmeyer flask with infusion apparatus again,
After being titrated to terminal, then scale its quality, it is calculated as m5；
A certain amount of pure water is taken, is added by the regulation in GB/T5750.6-2006 disodium ethylene diamine tetraacetate titration
Various other reagents in addition to EDTA are placed on balance and allowance for bark clearing, then EDTA standard solution is dripped to Erlenmeyer flask with infusion apparatus,
After being titrated to terminal, then scale its quality, it is calculated as m6；
The total hardness of water is calculated (with CaCO3Meter), the total hardness of water is calculated as follows:
ρ(CaCO3)=(V1-V0) * c*100.09*1000/V, unit mg/L；
Wherein,
V1=(m5-m4)/m2, unit mL；
V=m3/m1, unit mL；
V0=m6/m2, unit mL；
C is the concentration of EDTA standard solution, unit mol/L.
The reagent used in detection process of the present invention is prepared in advance and is stored in polyethylene bottle, is carried to field.
It is 200.00g and can accurate weighing that the equipment used in detection process of the present invention, which includes: 1 maximum weighing range,
To the portable electronic balance of 0.01g, 1 150mL conical flask, 1 1-10mL liquid-transfering gun, 1 branch infusion tube.
Embodiment 3
The present embodiment provides a kind of detection methods of field emergency Drinking Water hardness, comprising steps of
1.00mL water sample is drawn, its quality of scale is denoted as m1；1.00mLEDTA standard solution is drawn again, its quality of scale is calculated as
m2；
150mL Erlenmeyer flask is placed on balance and allowances for bark clearing, then adds the water of 50.00g or more into Erlenmeyer flask, its quality of scale,
It is calculated as m3；It is added again by the regulation in GB/T5750.6-2006 disodium ethylene diamine tetraacetate titration other each in addition to EDTA
Kind of reagent, then scale its quality, are calculated as m4；EDTA standard solution is dripped to Erlenmeyer flask with infusion apparatus again, after being titrated to terminal, then scale
Its quality, is calculated as m5；
A certain amount of pure water is taken, is added by the regulation in GB/T5750.6-2006 disodium ethylene diamine tetraacetate titration
Various other reagents in addition to EDTA are placed on balance and allowance for bark clearing, then EDTA standard solution is dripped to Erlenmeyer flask with infusion apparatus,
After being titrated to terminal, then scale its quality, it is calculated as m6；
The total hardness of water is calculated (with CaCO3Meter), the total hardness of water is calculated as follows:
ρ(CaCO3)=(V1-V0) * c*100.09*1000/V, unit mg/L；
Wherein,
V1=(m5-m4)/m2, unit mL；
V=m3/m1, unit mL；
V0=m6/m2, unit mL；
C is the concentration of EDTA standard solution, unit mol/L.
The reagent used in detection process of the present invention is the finished product reagent of purchase, is carried to field.
It is 200.00g and can accurate weighing that the equipment used in detection process of the present invention, which includes: 1 maximum weighing range,
To the portable electronic balance of 0.01g, 1 150mL conical flask, 1 1-10mL liquid-transfering gun, 1 branch infusion tube.
Embodiment 4
The present embodiment provides a kind of detection methods of field emergency Drinking Water hardness, comprising steps of
1.00mL water sample is drawn, its quality of scale is denoted as m1；1.00mLEDTA standard solution is drawn again, its quality of scale is calculated as
m2；
150mL Erlenmeyer flask is placed on balance and allowances for bark clearing, then into Erlenmeyer flask plus 50.00g or more than water, its matter of scale
Amount, is calculated as m3；It is added again by the regulation in GB/T5750.6-2006 disodium ethylene diamine tetraacetate titration other in addition to EDTA
Various reagents, then scale its quality, allowance for bark clearing, are calculated as m4(m4It is calculated as 0)；EDTA standard solution is dripped to infusion apparatus again tapered
Bottle, after being titrated to terminal, then scale its quality, it is calculated as m5；
A certain amount of pure water is taken, is added by the regulation in GB/T5750.6-2006 disodium ethylene diamine tetraacetate titration
Various other reagents in addition to EDTA are placed on balance and allowance for bark clearing, then EDTA standard solution is dripped to Erlenmeyer flask with infusion apparatus,
After being titrated to terminal, then scale its quality, it is calculated as m6；
The total hardness of water is calculated (with CaCO3Meter), the total hardness of water is calculated as follows:
ρ(CaCO3)=(V1-V0) * c*100.09*1000/V, unit mg/L；
Wherein,
V1=(m5-m4)/m2, unit mL；
V=m3/m1, unit mL；
V0=m6/m2, unit mL；
C is the concentration of EDTA standard solution, unit mol/L.
The reagent used in detection process of the present invention is the finished product reagent of purchase, is carried to field.
It is 200.00g and can accurate weighing that the equipment used in detection process of the present invention, which includes: 1 maximum weighing range,
To the portable electronic balance of 0.01g, 1 150mL conical flask, 1 1-10mL liquid-transfering gun, 1 branch infusion tube.
Control group
This control group is to drink according to GB/T5750.6-2006 disodium ethylene diamine tetraacetate titration to field emergency life
The water hardness is detected.
What the embodiment of the present invention 1 to embodiment 4, control group detected is identical water sample, and the result detected is as follows
Shown in table 1.Data can see that from table, and the total hardness value of the water of control group is mentioned with using the embodiment of the present invention 1 to embodiment 4
The total hardness value for the water that the method for confession detects is very close, illustrates that detection method timeliness provided by the invention is high, accurate
Property it is high.
The total hardness value of the water of the different group detections of table 1
| Group | Detection limit | The total hardness value of water |
| Embodiment 1 | 1.00mL | 427.9mg/L |
| Embodiment 2 | 1.00mL | 428.2mg/L |
| Embodiment 3 | 1.00mL | 428.0mg/L |
| Embodiment 4 | 1.00mL | 428.5mg/L |
| Control group | 1.00mL | 428.3mg/L |
The detection method of Drinking Water hardness provided by the invention can solve to avoid frangible glassware is carried
The problem of certainly existing method device therefor is easily broken, not readily portable and field operation；Detection is carried out at the scene to improve in fact
The timeliness tested；EDTA can do the final mean annual increment solution with perfusion tube and directly use that (variation of closed container solution concentration is small, improves real
The accuracy tested)；Reagent waste is few, saves resource；Capacity analysis project suitable for all water quality.
It should be noted that unless otherwise indicated, technical term or scientific term used in this application should be this hair
The ordinary meaning that bright one of ordinary skill in the art are understood.Unless specifically stated otherwise, it otherwise illustrates in these embodiments
Component and opposite step, numerical expression and the numerical value of step are not limit the scope of the invention.It is illustrated and described herein
In all examples, unless otherwise prescribed, any occurrence should be construed as merely illustratively, not as limitation, because
This, other examples of exemplary embodiment can have different values.
In the description of the present invention, it is to be understood that, term " first ", " second " are used for description purposes only, and cannot
It is interpreted as indication or suggestion relative importance or implicitly indicates the quantity of indicated technical characteristic.Define as a result, " the
One ", the feature of " second " can explicitly or implicitly include one or more of the features.In the description of the present invention,
The meaning of " plurality " is two or more, unless otherwise specifically defined.
Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention., rather than its limitations；To the greatest extent
Pipe present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that: its according to
So be possible to modify the technical solutions described in the foregoing embodiments, or to some or all of the technical features into
Row equivalent replacement；And these are modified or replaceed, various embodiments of the present invention technology that it does not separate the essence of the corresponding technical solution
The range of scheme should all cover within the scope of the claims and the description of the invention.
Claims (8)
1. a kind of detection method of field emergency Drinking Water hardness, which is characterized in that comprising steps of
1.00mL water sample is drawn, its quality of scale is denoted as m1；1.00mLEDTA standard solution is drawn again, its quality of scale is calculated as m2；
150mL Erlenmeyer flask is placed on balance and allowances for bark clearing, then into Erlenmeyer flask plus 50.00g or more than water, its quality of scale, meter
For m3；It is added again by the regulation in GB/T5750.6-2006 disodium ethylene diamine tetraacetate titration various other in addition to EDTA
Reagent, then scale its quality, are calculated as m4；EDTA standard solution is dripped to Erlenmeyer flask with infusion apparatus again, after being titrated to terminal, then scale its
Quality is calculated as m5；
A certain amount of pure water is taken, is removed by the regulation addition in GB/T5750.6-2006 disodium ethylene diamine tetraacetate titration
Various other reagents outside EDTA are placed on balance and allowance for bark clearing, then EDTA standard solution is dripped to Erlenmeyer flask with infusion apparatus, drop
It is fixed to after terminal, then scale its quality is calculated as m6；
Calculate the total hardness of water.
2. the detection method of field emergency Drinking Water hardness according to claim 1, it is characterised in that:
The total hardness of the water is with CaCO3Meter.
3. the detection method of field emergency Drinking Water hardness according to claim 2, which is characterized in that water it is total hard
Degree is calculated as follows:
ρ(CaCO3)=(V1-V0) * c*100.09*1000/V, unit mg/L；
Wherein,
V1=(m5-m4)/m2, unit mL；
V=m3/m1, unit mL；
V0=m6/m2, unit mL；
C is the concentration of EDTA standard solution, unit mol/L.
4. the detection method of field emergency Drinking Water hardness according to claim 1, which is characterized in that water it is total hard
Degree is calculated as follows:
Measure m4When allowance for bark clearing, m at this time4It is calculated as 0.
5. the detection method of field emergency Drinking Water hardness according to claim 1, it is characterised in that:
The reagent used in detection process is prepared in advance and is stored in polyethylene bottle, is carried to field.
6. the detection method of field emergency Drinking Water hardness according to claim 1, it is characterised in that:
The reagent used in detection process is the finished product reagent of purchase, is carried to field.
7. the detection method of field emergency Drinking Water hardness according to claim 1, it is characterised in that:
The equipment used in detection process includes: the portable electronic balance that 1 maximum weighing range is 200.00g, and 1
150mL conical flask, 1 1-10mL liquid-transfering gun, 1 branch infusion tube.
8. the detection method of field emergency Drinking Water hardness according to claim 7, it is characterised in that:
The portable electronic balance can accurate weighing to 0.01g.
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