USGS

Water Quality in the Rio Grande Valley, Colorado, New Mexico, and Texas, 1992-95

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SUMMARY OF COMPOUND DETECTIONS AND CONCENTRATIONS

The following tables summarize data collected for NAWQA studies from 1992-95 by showing results for the Rio Grande Valley Study Unit compared to the NAWQA national range for each compound detected. The data were collected at a wide variety of locations and times. In order to represent the wide concentration ranges observed among Study Units, logarithmic scales are used to emphasize the general magnitude of concentrations (such as 10, 100, or 1000), rather than the precise number. The complete dataset used to construct these tables is available upon request.

  Water samples: Compounds detected || Compounds not detected

  Fish tissue and bed sediment samples: Compounds detected || Compounds not detected


Concentrations of pesticides, volatile organic compounds, and nutrients detected in ground and surface waters of the Rio Grande Valley Study Unit.

[mg/L, milligrams per liter; µg/L, micrograms per liter; pCi/L, picocuries per liter; %, percent; <, less than; - -, not measured; trade names may vary]

EXPLANATION

Colors and symbols representing water-quality criteria and NAWQA data

Herbicide
(Trade or common name)

Rate
of
detec-
tionb

Concentration, in µg/L
Rakescale: 0.001 - 1,000 ug/L

Atrazine (AAtrex, Gesaprim) <1%
1%

Deethylatrazinec (Atrazine metabolite) <1%
0%

Bentazon (Basagran, bentazone) 1%
1%

Bromacil (Hyvar X, Urox B, Bromax) 0%
1%

Cyanazine (Bladex, Fortrol) <1%
0%

2,4-D (2,4-PA) 1%
0%

DCPA (Dacthal, chlorthal-dimethyl) 10%
0%

Dacthal, mono-acid (Dacthal metabolite) 2%
0%

Diuron (Karmex, Direx, DCMU) 1%
0%

EPTC (Eptam) 3%
0%

Herbicide
(Trade or common name)

Rate
of
detec-
tionb

Concentration, in µg/L
Rakescale: 0.001 - 1,000 ug/L

Metolachlor (Dual, Pennant) 11%
6%

Metribuzin (Lexone, Sencor) 2%
2%

Napropamide (Devrinol) 0%
1%

Pendimethalin (Prowl, Stomp, Herbadox, pendimethaline) 1%
0%

Prometon (Gesagram, prometone) 7%
8%

Simazine (Aquazine, Princep, GEsatop, Weedex) 12%
0%

Tebuthiuron (Spike, Perflan) 3%
0%

Trifluralin (Treflan, Trinin, Elancolan) 1%
0%

 

Insecticide
(Trade or common name)

Rate
of
detec-
tionb

Concentration, in µg/L
Rakescale: 0.001 - 1,000 ug/L

Azinphos-methylc (Guthion, Gusathion M) 1%
0%

Carbarylc (Sevin, Savit) 6%
1%

Carbofuranc (Furadan, Curaterr, Yaltox) 11%
1%

Chlorpyrifos (Dursban, Lorsban, Dowco 179, Genpest, chlorpyrifos-ethyl, chlorpyriphos) 3%
0%

p,p'-DDE (p,p'-DDT metabolite) <1%
<1%

Insecticide
(Trade or common name)

Rate
of
detec-
tionb

Concentration, in µg/L
Rakescale: 0.001 - 1,000 ug/L

Diazinon 10%
1%

gamma-HCH 2%
0%

Malathion (maldison, malathon, Cythion) 1%
0%

Propargite (Comite, Omite, BPPS) 1%
0%

Terbufos (Counter) 1%
0%

 

Volatile organic compound
(Trade or common name)

Rate
of
detec-
tionb

Concentration, in µg/L
Rakescale: 0.01 - 1,000 ug/L

Trichloroethene (TCE) --
1%

cis-1,2-Dichloroethene ((Z)-1,2-Dichloroethene) --
2%

p-Isopropyltoluene (p-Cymene) --
1%

1,1-Dichloroethane (Ethylidene dichloride) --
2%

Dimethylbenzenes (Xylenes, total) --
3%

Volatile organic compound
(Trade or common name)

Rate of
detectionb

Concentration, in µg/L
Rakescale: 0.01 - 100,000 ug/L

Methyl tert-butyl etherd (MTBE) --
2%

 

Nutrient
(Trade or common name)

Rate of
detectionb

Concentration, in mg/L
Rakescale: 0.01 - 100,000 mg/L

Dissolved ammonia 75%
78%

Dissolved ammonia plus organic nitrogen as nitrogen 53%
39%

Dissolved phosphorus as phosphorus 82%
72%

Dissolved nitrite plus nitrate 66%
65%

Other

Rate of
detectionb

Concentration, in pCi/L
Rakescale: 1 - 100,000 pCi/L

Radon 222 --
100%

 


Herbicides, insecticides, volatile organic compounds, and nutrients not detected in ground and surface waters of the Rio Grande Valley Study Unit.

Herbicides

2,4,5-T
2,4,5-TP (Silvex, Fenoprop)
2,4-DB (Butyrac, Butoxone, Embutox Plus, Embutone)
2,6-Diethylaniline (Metabolite of Alachlor)
Acetochlor (Harness Plus, Surpass)
Acifluorfen (Blazer, Tackle 2S)
Alachlor (Lasso, Bronco, Lariat, Bullet)
Benfluralin (Balan, Benefin, Bonalan, Benefex)
Bromoxynil (Buctril, Brominal)
Butylate (Sutan +, Genate Plus, Butilate)
Chloramben (Amiben, Amilon-WP, Vegiben)
Clopyralid (Stinger, Lontrel, Reclaim, Transline)
Dicamba (Banvel, Dianat, Scotts Proturf)
Dichlorprop (2,4-DP, Seritox 50, Kildip, Lentemul)
Dinoseb (Dinosebe)
Ethalfluralin (Sonalan, Curbit)
Fenuron (Fenulon, Fenidim)
Fluometuron (Flo-Met, Cotoran, Cottonex, Meturon)
Linuron (Lorox, Linex, Sarclex, Linurex, Afalon)
MCPA (Rhomene, Rhonox, Chiptox)
MCPB (Thistrol)
Molinate (Ordram)
Neburon (Neburea, Neburyl, Noruben)
Norflurazon (Evital, Predict, Solicam, Zorial)
Oryzalin (Surflan, Dirimal)
Pebulate (Tillam, PEBC)
Picloram (Grazon, Tordon)
Pronamide (Kerb, Propyzamid)
Propachlor (Ramrod, Satecid)
Propanil (Stam, Stampede, Wham, Surcopur, Prop-Job)
Propham (Tuberite)
Terbacil (Sinbar)
Thiobencarb (Bolero, Saturn, Benthiocarb, Abolish)
Triallate (Far-Go, Avadex BW, Tri-allate)
Triclopyr (Garlon, Grandstand, Redeem, Remedy)

Insecticides

3-Hydroxycarbofuran (Carbofuran metabolite)
Aldicarb sulfone (Standak, aldoxycarb, aldicarb metabolite)
Aldicarb sulfoxide (Aldicarb metabolite)
Aldicarb (Temik, Ambush, Pounce)
Dieldrin (Panoram D-31, Octalox, Compound 497, Aldrin epoxide)
Disulfoton (Disyston, Di-Syston, Frumin AL, Solvirex, Ethylthiodemeton)
Ethoprop (Mocap, Ethoprophos)
Fonofos (Dyfonate, Capfos, Cudgel, Tycap)
Methiocarb (Slug-Geta, Grandslam, Mesurol)
Methomyl (Lanox, Lannate, Acinate)
Methyl parathion (Penncap-M, Folidol-M, Metacide, Bladan M)
Oxamyl (Vydate L, Pratt)
Parathion (Roethyl-P, Alkron, Panthion, Phoskil)
Phorate (Thimet, Granutox, Geomet, Rampart)
Propoxur (Baygon, Blattanex, Unden, Proprotox)
alpha-HCH (alpha-BHC, alpha-lindane, alpha-hexachlorocyclohexane, alpha-benzene hexachloride)
cis-Permethrin (Ambush, Astro, Pounce, Pramex, Pertox, Ambushfog, Kafil, Perthrine, Picket, Picket G, Dragnet, Talcord, Outflank, Stockade, Eksmin, Coopex, Peregin, Stomoxin, Stomoxin P, Qamlin, Corsair, Tornade)

Volatile organic compounds

1,1,1,2-Tetrachloroethane (1,1,1,2-TeCA)
1,1,1-Trichloroethane (Methylchloroform)
1,1,2,2-Tetrachloroethane
1,1,2-Trichloro-1,2,2-trifluoroethane (Freon 113, CFC 113)
1,1,2-Trichloroethane (Vinyl trichloride)
1,1-Dichloroethene (Vinylidene chloride)
1,1-Dichloropropene
1,2,3-Trichlorobenzene (1,2,3-TCB)
1,2,3-Trichloropropane (Allyl trichloride)
1,2,4-Trichlorobenzene
1,2,4-Trimethylbenzene (Pseudocumene)
1,2-Dibromo-3-chloropropane (DBCP, Nemagon)
1,2-Dibromoethane (EDB, Ethylene dibromide)
1,2-Dichlorobenzene (o-Dichlorobenzene, 1,2-DCB)
1,2-Dichloroethane (Ethylene dichloride)
1,2-Dichloropropane (Propylene dichloride)
1,3,5-Trimethylbenzene (Mesitylene)
1,3-Dichlorobenzene (m-Dichlorobenzene)
1,3-Dichloropropane (Trimethylene dichloride)
1,4-Dichlorobenzene (p-Dichlorobenzene, 1,4-DCB)
1-Chloro-2-methylbenzene (o-Chlorotoluene)
1-Chloro-4-methylbenzene (p-Chlorotoluene)
2,2-Dichloropropane
Benzene
Bromobenzene (Phenyl bromide)
Bromochloromethane (Methylene chlorobromide)
Bromomethane (Methyl bromide)
Chlorobenzene (Monochlorobenzene)
Chloroethane (Ethyl chloride)
Chloroethene (Vinyl Chloride)
Chloromethane (Methyl chloride)
Dibromomethane (Methylene dibromide)
Dichlorodifluoromethane (CFC 12, Freon 12)
Dichloromethane (Methylene chloride)
Ethenylbenzene (Styrene)
Ethylbenzene (Phenylethane)
Hexachlorobutadiene
Isopropylbenzene (Cumene)
Methylbenzene (Toluene)
Naphthalene
Tetrachloroethene (Perchloroethene)
Tetrachloromethane (Carbon tetrachloride)
Total Trihalomethanes (Trichloromethane (Chloroform), Dibromochloromethane, Bromodichloromethane, Tribromomethane (Bromoform))
Trichlorofluoromethane (CFC 11, Freon 11)
cis-1,3-Dichloropropene ((Z)-1,3-Dichloropropene)
n-Butylbenzene (1-Phenylbutane)
n-Propylbenzene (Isocumene)
sec-Butylbenzene
tert-Butylbenzene
trans-1,2-Dichloroethene ((E)-1,2-Dichlorothene)
trans-1,3-Dichloropropene ((E)-1,3-Dichloropropene)

Nutrients

No non-detects


Concentrations of semivolatile organic compounds, organochlorine compounds, and trace elements detected in fish tissue and bed sediment of the Rio Grande Valley Study Unit.

[µg/g, micrograms per gram; µg/kg, micrograms per kilogram; %, percent; <, less than; - -, not measured; trade names may vary]

EXPLANATION

Colors and symbols representing water-quality criteria and NAWQA data

Semivolatile
organic compound

Rate
of
detec-
tionb

Concentration, in µg/kg
Rakescale: 0.1 - 100,000 ug/kg

1,6-Dimethylnaphthalene --
13%

1-Methylphenanthrene --
6%

1-Methylpyrene --
6%

2,3,6-Trimethylnaphthalene --
13%

2,6-Dimethylnaphthalene --
81%

2-Methylanthracene --
6%

3,5-Dimethylphenol --
13%

4,5-Methylenephenanthrene --
6%

9H-Carbazole --
19%

9H-Fluorene --
6%

Acenaphthylene --
13%

Anthracene --
38%

Anthraquinone --
13%

Benz[ a ]anthracene --
38%

Benzo[ a ]pyrene --
31%

Benzo[ b ]fluoranthene --
19%

Benzo[ ghi ]perylene --
13%

Benzo[ k ]fluoranthene --
19%

Semivolatile
organic compound

Rate
of
detec-
tionb

Concentration, in µg/kg

Rakescale: 0.1 - 100,000 ug/kg

Butylbenzylphthalate --
69%

Chrysene --
50%

Di- n -butylphthalate --
88%

Di- n -octylphthalate --
6%

Dibenz[ a,h ] anthracene --
6%

Dibenzothiophene --
13%

Diethylphthalate --
81%

Dimethylphthalate --
19%

Fluoranthene --
62%

Indeno[1,2,3- cd ] pyrene --
13%

Phenanthrene --
62%

Phenanthridine --
13%

Phenol --
50%

Pyrene --
56%

bis(2-Ethylhexyl)phthalate --
100%

p-Cresol --
69%

 

Organochlorine
compound
(Trade name)

Rate
of
detec-
tionb

Concentration, in µg/kg
Rakescale: 0.01 - 100,000 ug/kg

total-Chlordane 9%
0%

PCB, total 45%
0%

p,p'-DDE 91%
31%

total-DDT 91%
31%

gamma-HCH (lindane, gamma-BHC, gamma-benzene hexachloride, gamma-hexachlorocyclohexane) 9%
--

Hexachlorobenzene 9%
--

Trace
element

Rate
of
detec-
tionb

Concentration, in µg/g

Rakescale: 0.01 - 10,000 ug/g

Arsenic 92%
100%

Cadmium 83%
100%

Chromium 75%
100%

Copper 100%
100%

Lead 17%
100%

Mercury 75%
73%

Nickel 50%
100%

Selenium 100%
100%

Zinc 100%
100%


Semivolatile organic compounds, organochlorine compounds, and trace elements not detected in fish tissue and bed sediment of the Rio Grande Valley Study Unit.

Semivolatile organic compounds

1,2,4-Trichlorobenzene
1,2-Dichlorobenzene (o-Dichlorobenzene, 1,2-DCB)
1,2-Dimethylnaphthalene
1,3-Dichlorobenzene (m-Dichlorobenzene)
1,4-Dichlorobenzene (p-Dichlorobenzene, 1,4-DCB)
1-Methyl-9H-fluorene
2,2-Biquinoline
2,4-Dinitrotoluene
2,6-Dinitrotoluene
2-Chloronaphthalene
2-Chlorophenol
2-Ethylnaphthalene
4-Bromophenyl-phenylether
4-Chloro-3-methylphenol
4-Chlorophenyl-phenylether
Acenaphthene
Acridine
Azobenzene
Benzo [c] cinnoline
C8-Alkylphenol
Isophorone
Isoquinoline
N-Nitrosodi-n-propylamine
N-Nitrosodiphenylamine
Naphthalene
Nitrobenzene
Pentachloronitrobenzene
Quinoline
bis (2-Chloroethoxy)methane

Organochlorine compounds

Aldrin (HHDN, Octalene)
Chloroneb (chloronebe, Demosan, Soil Fungicide 1823)
DCPA (Dacthal, chlorthal-dimethyl)
Dieldrin (Panoram D-31, Octalox, Compound 497, Aldrin epoxide)
Endosulfan I (alpha-Endosulfan, Thiodan, Cyclodan, Beosit, Malix, Thimul, Thifor)
Endrin (Endrine)
Heptachlor epoxide (Heptachlor metabolite)
Heptachlor (Heptachlore, Velsicol 104)
Isodrin (Isodrine, Compound 711)
Mirex (Dechlorane)
Oxychlordane (Chlordane metabolite)
Pentachloroanisole (PCA, pentachlorophenol metabolite)
Total Trihalomethanes (Trichloromethane (Chloroform), Dibromochloromethane, Bromodichloromethane, Tribromomethane (Bromoform))
Toxaphene (Camphechlor, Hercules 3956)
alpha-HCH (alpha-BHC, alpha-lindane, alpha-hexachlorocyclohexane, alpha-benzene hexachloride)
beta-HCH (beta-BHC, beta-hexachlorocyclohexane, alpha-benzene hexachloride)
cis-Permethrin (Ambush, Astro, Pounce, Pramex, Pertox, Ambushfog, Kafil, Perthrine, Picket, Picket G, Dragnet, Talcord, Outflank, Stockade, Eksmin, Coopex, Peregin, Stomoxin, Stomoxin P, Qamlin, Corsair, Tornade)
delta-HCH (delta-BHC, delta-hexachlorocyclohexane, delta-benzene hexachloride)
o,p'-Methoxychlor
p,p'-Methoxychlor (Marlate, methoxychlore)
trans-Permethrin (Ambush, Astro, Pounce, Pramex, Pertox, Ambushfog, Kafil, Perthrine, Picket, Picket G, Dragnet, Talcord, Outflank, Stockade, Eksmin, Coopex, Peregin, Stomoxin, Stomoxin P, Qamlin, Corsair, Tornade)

Trace elements

No non-detects


a Selected water quality standards and guidelines (Gilliom and others, in press).

b Rates of detection are based on the number of analyses and detections in the Study Unit, not on national data. Rates of detection for herbicides and insecticides were computed by only counting detections equal to or greater than 0.01 µg/L to facilitate equal comparisons among compounds that had varying detection limits; a value of <1% signifies that there were only detections below, or <1% above, the 0.01 µg/L level. Some herbicides and insecticides were not reliably detected as low as the 0.01 µg/L level, so frequencies may be underestimated for some compounds. For other compound groups, all detections were counted and detection limits for most compounds were similar to the lower end of the national ranges shown. Method detection limits for all compounds in all groups are summarized in Gilliom and others, in press.

c Detections of these compounds are reliable, but concentrations are determined with greater uncertainty than for the other compounds and are reported as estimated values (Zaugg and others, 1995).

d The guideline for methyl tert-butyl ether is between 20 and 40 µg/L; if the tentative cancer classification C is accepted, the lifetime health advisory will be 20 µg/L (Gilliom and others, in press).

e Selected sediment quality guidelines (Gilliom and others, in press).


U.S. Geological Survey Circular 1162

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Suggested citation:
Levings, G.W., Healy, D.F., Richey, S.F., and Carter, L.F., 1998, Water Quality in the Rio Grande Valley, Colorado, New Mexico, and Texas, 1992-95: U.S. Geological Survey Circular 1162, on line at <URL: https://water.usgs.gov/pubs/circ1162>, updated May 18, 1998 .

This page is a subpage of <URL:http://water.usgs.gov/pubs/circ1162>
Email questions and comments to GS-W_NAWQA_Outreach@usgs.gov
Last modified: Mon Jun 22 17:21:08 1998