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Inland Aquatic Environment Monitoring
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Monitoring of Monitoring of Inland Inland Aquatic EnvironmentAquatic Environment
Wijarn Simachaya, Ph.D.
Water Quality Management BureauPollution Control Department
http://www.pcd.go.th
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Presentation Outline• Characteristics of Receiving Waters• Site Selection• Relevant Information gathering• Sampling Procedures• Sampling Handling and Preservation• Sampling Analysis• Data Evaluation
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What is a watershed?
Lake
Rivers and Streams
Mountain
Rainfall
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2525 River Basins in ThailandRiver Basins in Thailand
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Basin NoBasin No.. Name of River BasinsName of River BasinsCatchmentCatchment AreaArea
(sq.km.)
01 Salawin 17,92002 Mae Khong 57,42203 Kok 7,89504 Shi 49,47705 Mun 69,70006 Ping 33,89807 wang 10,79108 Yom 23,61609 Nan 34,33010 Chao Phraya 20,12511 Sakaekrang 5,19112 Pasak 16,29213 Thachin 13,68214 Mae Klong 30,83715 Prachinburi 10,48116 Bang Pakong 7,97817 Tonglesap 4,15018 East Coast 13,83019 Phetchaburi 5,60320 Prachuap Khiri Khan coast 6,74521 South East Coast 26,35322 Ta Pi 12,22523 Songkhla Lake 8,49524 Pattani 3,85325 South West Coast 21,172
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5Mekong River BasinMekong River Basin
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Monitoring Sites
Lakes, Springs, Headwaters and Rivers
Lakes are better
If there are no appropriate lakes,springs and headwaters, rivers shouldbe selected in this order.
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Water Balance of Lake
• Input (Major River + Lake Tributaries + Precipitation) - Evaporation +_ Groundwater = Output
• Seasonal Variations (Climate Changes, Rainfall, Solar Heating)
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Lake Acidification
• Acid Buffering Capacity due to the presence of dissolved salts from the watershed
- Harmonic lakes ( Oligotrophic or Mesotrophic ) - Low alkalinity ( less than 0.2 less than 0.2 meqmeq/L/L )- Low EC ( less than 10mS/mless than 10mS/m )-Closed to wet deposition monitoring sitewet deposition monitoring site- Depth of approximately 10m or less- Water retention time of 1 y. or less- Water area of 1 hector or more- Minimal anthropogenic water pollution- Representativeness of sitesshould be confirmed in terms of water quality (within half a year from the start of sampling/5 points).
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Sites Criteria
Springs, Headwaters & Rivers
•• SpringsSprings( upper stream area ) is better than rivers• In case of river sites, upper stream area or first
order streams is desirable.• With minimum pollution • Monitoring is only one upstream point• At river sites, no or small rainfall within 2 days
before monitoring
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Collection of Information on Monitoring Sites
The monitoring sites (lakes) should be selected from the inventory of lakes(e.g. water area larger than 1 h)
The information of the selected sites and their watersheds should be collected as much as possible
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Characteristics of LakesCharacteristics of Lakes• Location, Location Map, Elevation, Origin, Area,
Shore line length• Lake hydrologic type (seepage, closed, drainage, and
reservoir)• Lake trophic type (oligotrophic, mesotrophic,
eutrophic and dystrophic with indication of OECD criteria or others)
• Water depth (mean and maximum), Water volume, Bathometric map
• Range of annual water level fluctuation, Precipitation, Solar radiation
• Wind direction and speed (mean and dominant)• Residence time of water• Lake utilization (irrigation, domestic water, electric
power, fish culture, sightseeing, and others)• Water qualities
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Water Qualities• Water temperature, pH, EC,
Transparency, Color, Alkalinity, Dissolved oxygen, Organic carbon or COD and total aluminum
measure EC, pH, measure EC, pH, and alkalinityand alkalinity
MeasureMeasure W.T., pH, W.T., pH, and EC as and EC as reference datareference data
inin laboratorylaboratory
transportationtransportation
at sampling siteat sampling site
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Treatment procedure for attached Treatment procedure for attached matter in springs, headwaters and riversmatter in springs, headwaters and rivers
Attached Matter in Springs, Headwaters and Rivers
pick up rocks
scrape off attached matter by brushing, put in water
add formalin
measure species composition of diatom
do not add formalin
store in cool and dark
centrifuge
analyze chemical composition
at sampling siteat sampling site
transportationtransportation
in laboratoryin laboratory
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Transportationand
Storage of Samples
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Storage and Measurement in Lab.
Measure EC, pH and alkalinity as soon as possible (no filtered)
Measure other parameters in several days (filtered)
Storage in -20oC~ -40oC (more than several days)
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Measurementand Analysis
in Laboratory
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Measurement Condition for EC & pH
EC and pHare recommended to be measured in the
water bath at 25 oC in the laboratory, if a temperature controlled water bath is notavailable, use of water bath without temperature control but containing at least5 L of water may be considered.
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Measurement of alkalinityX = a × (1,000/sample (ml)) × f × 0.02
X : alkalinity (meq/L)a : titration volume (ml)
f = 25/xx : standard Na2CO3 solution used (ml) f : factor of standard sulfuric acid
• Measurement using a pH meter• Swirling with magnetic stirrer, but the sample
should be motionless at end-point pH4.
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Quality Assurance and Quality Control
(QA/QC) Program
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QA/QC ProgramData Quality Objectives (DQOs)
QC in sampling/chemical analysis organizations- On-site measurement and sampling - Measurement/Analysis in lab.- Cation and anion balance (R1), ( R2)
Site performance audit and laboratory auditExternal QA programTraining program
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Data Quality Objectives (DQOs) (1)Required accuracy and precision (unit: %)
Accuracy1) Precision2)
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1) AccuracyAccuracy is calculated by the following formula:A = [(certified values)-(analytical values)]
×100/(certified values)2) Precision (Precision (SSii)) is calculated by the following formula:
Si = (Σdi2/2Ni )1/2×100/Av
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Data Quality Objectives (DQOs) (2)Detection limitsDetection limits and determination limitsdetermination limits
+ 0.8 0.01 3.0 0.05Na+ 0.3 0.01 1.0 0.03K+ 0.3 0.01 1.0 0.04Ca2+ 0.2 0.01 0.6 0.03Mg2+ 0.3 0.01 1.0 0.03Alkalinity 5pH Replicate measurement of RM should agree to within within ±±0.05 pH value of 0.05 pH value of
RMRM.EC Replicate measurement of deionizeddeionized water (EC: less than 0.15mSmwater (EC: less than 0.15mSm--11) )
should be agree with should be agree with ±±0.02mSm0.02mSm--11.
RM: Reference material can be diluted by a laboratory working RM: Reference material can be diluted by a laboratory working standard for inland water analysisstandard for inland water analysis.
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Data validation A) Calculation of ion balance (R1)
A (µeq L-1)= C(SO42-)+C(NO3
-)+C(Cl-
)+((ALKALK))C (µeq L-1)= 10(6-pH) + C(NH4
+)+ C(Na+)+C(K+)+C(Ca2+)+C(Mg2+)
• Calculation of ion balance (R1)R1 = 100 × (C-A) / (C+A)
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Data validationA) Calculation of ion balance (R1)
in different concentration ranges(C + A) µeq L-1 R1
Relationship between observed electrical conductivityand R2 ( Kao Lam Dam , 2000)
R 2(%
)
Observed electrical conductivity (µS /cm )
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Double Measurement
Sampling, Transportation, Storage, Measurement
• Double Measurement will be carried out in above processes
• If the precision of two values are more more than 15%than 15%, the measurement should be done againdone again
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Data Management Data Management and and
EvaluationEvaluation
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Data Management Data Management Data ReportingData ReportingThe information concerning Siting, Sampling, Analyses and QC activities should be recorded, controlled and stored. Flags in Reporting Format are same as Wet Deposition tentativelyData EvaluationData EvaluationNational Centers and Network Center should carry out
QA/QC individually
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Data reportingData reporting• Result of measurement• Information about sampling sites• Matters related to collection of samples• Matters related to analytical procedures• Local quality control activities
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Properties of Khao Lam Dam : Kanchanaburi ProvinceAltitudeOriginArea and shapeShore line lengthLake hydrologic typeLake trophic typeWater depthWater volumeAnnual water level fluctuationPrecipitationSolar radiationWind speedWind directionResidence time of waterLake utilizationWatershed areaRiver ( flow into)
170 mArtificial (Dam made lake)3,720 km2
-Reservoir-Avg.149.08 m(max :153.21 m )
6.7276 km20-18 m ( avg.9 m )
1,780 mm/y(2001)-
Avg. 0.47 m/s( .01-.09 m/s)SE, NW, W ( s), W( r ) , SE ( w )165 daysIrrigation and Electric power