WATER QUALITY SURVEY
OF THE
POTOMAC ESTUARY
EMBAYMENTS AND TRANSECTS
1970
DATA REPORT
Number 28
ATLANTIC REGION- ft? 6th and Walnut Streets. Philadelphia, Pennsylvania 19106
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Annapolis Field Office
I Region III
Environmental Protection Agency
1970 Data Report
Number 28
WATER QUALITY SURVEY
OF THE
POTOMAC ESTUARY
EMBAYMENTS AND TRANSECTS
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Staff:
James W. Marks, Chief, Analytical Laboratory Section
Orterio Villa, Jr., Chief, Development Laboratory Section
I Anna R. Favorite, Statistician
Evelyn P. McPherson, Technician
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TABLE OF CONTENTS
Page
I INTRODUCTION ................................. 1
I II STATION LOCATIONS ............................ 6
m III SURVEY RESULTS ............................... 9
IV MAP .................................. appendix i
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I INTRODUCTION
A. Purpose and Scope
During 1970, water quality studies were continued by the
Annapolis Field Office, Region III, Environmental Protection
B Agency in the Potomac estuary watershed. Purpose of these
g| surveys was to determine existing water quality. The results
of these investigations are presented in this report.
B. General Remarks
Transect stations were sampled during February and March.
| Mid-channel samples only were taken using stations that had
previously been transected. Also included in this report are
* selected embayments sampled from February to July. Nutrient
as well as dissolved oxygen, carbon and chlorophyll a anal-
yses were made by the Annapolis Field Office.
C. Sampling Procedures
Samples were obtained using a small submersible pump at-
tached to a wire cable calibrated in feet. The pump was
lowered to the desired depth and allowed to run for two min-
utes before receiving samples in plastic containers. Dissolved
oxygen (DO) samples were obtained directly from the pump out-
let extending to the bottom of a conventional 300 ml DO bottle.
The sample was allowed to overflow the bottle several times
and fixed. All samples were immediately stored on ice and
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analyses started upon return to the laboratory, generally
within two hours of sampling.
D. Measured Parameters and Analytical Methods
| 1. Water temperature was read from a Beckman Salin-
ometer.
2. Light extinction, in inches, was made with a 12"
flj (30 cm) white secchi disk.
3. Conductivity was read from a calibrated Beckman
Salinometer.
It. Salinity was determined with a calibrated Beckman
Salinometer.
5. Total phosphorus
Reference: Menzel, D.W. and Corwin, N. , 1965. The
Measurement of Total Phosphorus in Seawater Based on the Lib-
eration of Organically Bound Fractions by Persulfate Oxidation.
Limonology and Oceanography, 10: 280-282.
Murphy, J. and Riley, J.P., 1962. A Modified Single
Solution Method for the Determination of Phosphate in Natural
Waters. Analytica Chimica Acta, 2?: 31-36.
Total Phosphorus was determined after persulfate
f oxidation of the sample in an autoclave at 15> psi for 30
minutes. The resultant ortho-phosphate was then determined
* colorimetrically as the molybdenum-blue complex with the op-
fl tical density measured at 882 iti(j,.
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6. Inorganic Phosphorus
Reference: Murphy, J. and Riley, J.P., 1962. A
Modified Single Solution Method for the Determination of Phos-
phate in Natural Waters. Analytica Chimica Acta, 27: 31-36.
Inorganic Phosphorus was determined by automation
of the above procedure using the Technicon "Auto Analyzer."
The molybdenum-blue complex formed was determined colorimet-
rically with the optical density measured at 88f> mp,.
I 7. Total Kjeldahl Nitrogen
Reference: Standard Methods for the Examination of
Water and Wastewater, 12 ed., 1965.
g| Total Kjeldahl Nitrogen includes ammonia and organ-
ic nitrogen and was determined by the standard micro-kjeldahl
procedure. The sample was digested in the presence of strong
acid to convert the organic nitrogen to ammonia. The ammonia
| was then distilled, collected in boric acid solution, nessler-
m ized and determined colorimetrically.
8. Nitrate + Nitrite
Reference: A Practical Handbook of Sea Water Analysis,
J.D.H. Strickland and T.R. Parsons, Bulletin 167, Fisheries
0 Research Board of Canada, Ottawa, Canada, 1968.
M Nitrate plus nitrite nitrogen was determined by auto-
mation of the above procedure using the Technicon "Auto Analป
yzer." This procedure utilizes cadmium reduction of nitrate
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to nitrite and subsequent diazotization with sulfanilamide
and N-(l-naphthyl)-ethylenediamine dihydrochloride with the
optical density measured at 5kO mn. The results were report-
V ed as nitrogen.
m 9. Ammonia
Reference: Southeast Water Laboratory, FWQA,
Methodology for the colorimetric determination of ammonia
by the phenol-hypochlorite reaction.
| FWPCA Methods for Chemical Analysis of Water and
M Wastes, November 1969.
Ammonia nitrogen was determined by automation of
the phenol-hypochlorite procedure as described in the South-
east Water Laboratory Methodology and later adopted as the
|| official FWPCA procedure. The intensity of the indophenol
_ blue color, formed by the reaction of ammonia with alkaline
phenol-hypochlorite, was increased using sodium nitropruss^de
as an intensifying agent. The optical density was measured
at 630 mn and calculated as NHo-N.
10. Dissolved Oxygen
Reference: FWPCA Methods for Chemical Analysis of
Water and Wastes, November 1969.
Dissolved Oxygen was determined by the azide modi-
fication of the basic Winkler method with the titration done
potentiometrically with a Fisher automatic "titralyzer."
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11. Total Organic Carbon
Reference: FWPCA Methods for Chemical Analysis of
Water and Wastes, November 1969.
Total Organic Carbon was determined with a Dow-
Beckman Carbonaceous Analyzer after the sample had been purged
with nitrogen gas for five minutes.
12. Total Carbon
Reference: Beckman Instruments, Bulletin lj.059.
Total Carbon was determined with a Dow-Beckman
Carbonaceous Analyzer using the sample as received.
I 13. Chlorophyll a
m Reference: A Practical Handbook of Sea Water Anal-
ysis, J.D.H. Strickland and T.R. Parsons, Bulletin 16?, Fish-
eries Research Board of Canada, Ottawa, Canada. 1968.
Chlorophyll a. was determined by extraction of milli-
| pore filtered samples in 90$ acetone and read spectrophoto-
ซ metrically.
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II STATION LOCATIONS
Transect Station Location
I 7 Piscataway "77"
8 Dogue Creek Fl "67"
g 8A Gunston Cove Fl "6U"
9 Hallowing Point Fl "59"
10 Indian Head N "ฃU"
10A Occoquan Bay Fl "5l"
11 Possum Point Fl "iUt"
| 12 Sandy Point N "UO"
I 13 Smith Point Fl "27"
lU Maryland Point Fl "21"
15 Nanjemoy Creek N "10"
Port Tobacco C "3"
16 301 Bridge
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Embayment Station Location
7 1 Piscataway Creek, headwaters
7 2 It II
73 " " , mouth
7 MC Potomac Fl "77"
8 1 Dogue Creek, above boathouse
82 " " , opposite boathouse
83 " " , midway boathouse and Fl "67"
8 MC Potomac Fl "67"
8A I Gunston Cove
8A 2 " " , Can "3"
8A 3 " " , Nun "2"
8A MC Potomac Fl "6k"
10 MC Indian Head
IDA 0 Occoquan Bay, Fl "12"
IDA 1 " " , Fl "9"
10A 2 " " , Fl "6"
10A 3 " " , Fl "2"
10A 3A " " , Mid bay
10A MC Potomac Fl "ฃl"
10B 0 Mattawoman Creek, near bridge
10B 1 " '< , Bullitt Neck
10B 2 " " , Sweden Point
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10B MC Potomac Fl "
11 MC Possum Point
12 MC Sandy Point
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Enibayment Station _ Location _
fl 10B 3 Mattawoman Creek, Deep Point
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16
POTOMAC ESTUARY
EMBAYMENTS AND TRANSECTS
1970
10
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