Nitrate,N‐total,sulphateandchlorine

insurfacewater‐Odderstream

NiCATechnicalNote

September2013

VibekeErnstsenGeologicalSurveyofDenmarkandGreenland

 

 

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1

Content

Introduction 2 

Sampling site 3 

Water sampling 5 

Nitrate, N-total, chlorine, and sulphate 7 

References 9 

Acknowledgement 9 

2

Introduction

The concentration of nitrate in tributary streams and creeks to the Odder-Rævså stream has been reported in a NiCA technical note by Nilsson (2013). This note describes the con-tent of nitrate in stream - and creek water collected in August 2011 (summer) and Decem-ber 2011 (winter). In addition to these snap shot measurements of nitrate, equipment for continuous water sampling was established at the site where Odder stream passes the farm Sander Enggård to meet the need for long-term records of the concentration of nitrate. In addition to the measurements of nitrate, the water samples were also analyzed for N-total, sulphate and chlorine. This technical note describes the location and establishment of the water sampling equip-ment, the frequency of collection of water samples, laboratory methods and the results ob-tained from 10th November 2011 to 13th August 2013.

S

Eqlisdivweou

Finocoth

Threst

Samplin

quipment thshed northeaver for monere availableut of the catc

igure 1. Watorth-east of olor shows we Odder-Ræ

he water saefrigerated ISalled in a he

ng site

at has beenast of Oddeitoring of the. Monitorinchment.

ter samples Odder. The

where the Saævså stream

mples from SCO water eat insulated

n used for coer by Sandee water leveg of the wat

were collectupper pictur

ander Enggåcatchment s

Odder streasampler (Te

d shanty hou

3

ollecting waer Enggård, el was alreater level mak

ted from Oddre shows th

ård farm andshown with a

am were coleledyne, Linuse, Figure 2

ter samplesFigure 1. T

ady establishkes it possib

der stream ce farm and

d the water slilac line.

llected over ncoln, NE, U2 and 3.

s from OddeThe site washed here anble to calcula

close to the SOdder strea

sampling site

time using aUS). The ISC

er stream was chosen bend long termate the flux

Sander Enggam. The arroe were locat

a 6712FR fiCO sampler

as estab-ecause a

m records of nitrate

gård farm ow in red ted within

iberglass r was in-

Figure 2ated ISC

Figure 3the wate

2. The heat iCO water sam

3. The heat ier level at Au

nsulated shampler. The m

insulated shaugust 3th 201

anty house wmodel is show

anty house a1.

4

with an almown by the littl

after installat

ost installed 6e picture ins

tion located

6712FR fibeet.

close to Odd

erglass refrig

der stream a

er-

and

W

W13 Thpl219th

T

141

Ta Thwahish

Fi

Water s

Water sample3th August 2

he samplinges were col1th August 2h and 10th M

Time

10th Novemb4th April 201210th July 201

able 1. Sam

he water leater level sigh water levhanty house

igure 4. Wat

amplin

es were coll013.

g density is lected 19th D

2012, 23th SeMarch 2013.

ber 2011 to 42 to 4th July 12 to 13th Au

mpling densit

vel changedituatin in Odvel at the 12

e.

ter level at O

g

ected from O

given in tabDecember 2eptember 20

4th April 2012012

ugust 2013

ty of water s

d markedly dder stream2th Decembe

Odder stream

5

Odder strea

ble 1. Due to2011, 31th J012 to 14th

S

2 1 1 1

samples from

over the sm at the 17th

er where the

m the 17th May

am in the pe

o technical oanuary 2012November 2

ampling de

sample of 2sample of 7sample of 2

m Odder Stre

sampling peh May 2011 e water in the

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eriod 10th No

or other rea2, 31th Marc2012, 3th to

ensity

2 subsample7 subsample2 subsample

eam.

riod. Figureand Figure

e stream rea

ovember 20

asons no wach 2012, 22n

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e 4 illustratee 5 illustrateach almost

11 to the

ater sam-nd July to 2013 and

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6

Figure 5. Very high water level in the Odder stream 5th January 2012. The diver is seen in the back.

7

Nitrate, N-total, chlorine, and sulphate

The water samples were preserved at 4 °C until they were analyzed. The water samples were filtered using a 0,45 µm Q-MAX ® Syringe PES filter (Frisenette ApS, Knebel, Den-mark) before analyses. Nitrate (NO3), chlorine (Cl), and sulphate (SO4), were measured using an IC system with a 19 IC Detector, 820 IC Separation Center, 818 IC Pump, 833 IC Liquid handling Unit equipped with a Metrosep A Supp 5 column connected to a 838 Advanced IC Sample pro-cessor (Metrohm Ltd, Herisau Switzerland). The concentration of total nitrogen (N-tot) was measured at a Shimadzu TOC-V CPH with a Total Nitrogen Unit (TNM-1) and a Shimadzu ASI-V 93 TOC auto sampler (Shimadzu Cor-poration, Tokyo, Japan). The concentrations of nitrate and total nitrogen with time are given in figure 6. The ratio between nitrate-N and total N over time is given in figure 7. The concentrations of chlorine over time are given in figure 8 and the concentrations of sulphate over time are given in figure 9. All the data is available in an excel file.

Figure 6. Nitrate calculated as nitrate-N (NO3-N) and total amount of nitrogen (N-total) over the sampling period from 10th November to 13th August.2013.

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NO

3‐N & N‐tot (m

g/L)

NO3‐N N‐tot

8

Figure 7. Ratio between nitrate-N (NO3-N) and total nitrogen (N-tot) in per cent over the sam-pling period from 10th November to 13th August.2013.

Figure 8. Chlorine over the sampling period from 10th November to 13th August.2013.

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NO

3:N‐tot ratio (%

)

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100

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200

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Cl (mg/L)

9

Figure 9. Sulphate over the sampling period from 10th November to 13th August.2013.

References

Nilsson, B. 2013. Exchange of nitrate in the transition zone between groundwater and stream water in the Norsminde catchment. Technical NiCA note. Available at www.nitrate.dk

Acknowledgement

We want to thank Lasse Gudmundsson and Per Jensen, GEUS, for planning and installa-tion of the water sampling equipment, collection of water samples, and many illustrative pictures from the site. Also thank to Christina Rosenberg Lynge and Pernille Stockmarr, GEUS, for handling and measurements of water samples in Inorganic Laboratory at GEUS.

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SO4(m

g/L)