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SUMMARY OF COMPOUND DETECTIONS AND CONCENTRATIONS

Herbicides

Contents| Summary of Compound Detections and Concentrations—Insecticides


Concentrations of herbicides, insecticides, volatile organic compounds, and nutrients detected in ground and surface waters of the Trinity River Basin Study Unit

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

 

EXPLANATION

explanation graph for detections


Freshwater-chronic criterion for the protection of aquatic life
a


Drinking-water standard or guideline
a

Range of surface-water detections in all 20 Study Units

Range of ground-water detections in all 20 Study Units

Detection in the Trinity River Basin Study Unit

 

 

 

Herbicide
(Trade or common name)  
Rate of detec-
tionb  
Concentration, in mg/L 
 explanation graph

Acetochlor

7%

0%

graph showing detections

Acifluorfen (Blazer, Tackle 2S)

1%

0%

graph showing detections

Alachlor (Lasso)

15%

0%

graph showing detections

2,6-Diethylaniline (Alachlor metabolite)

<1%

0%

graph showing detections

Atrazine (AAtrex, Gesaprim)

88%

3%

graph showing detections

Deethylatrazinec (Atrazine metabolite)

71%

4%

graph showing detections

Bentazon (Basagran, bentazone)

4%

1%

graph showing detections

Bromacil (Hyvar X, Urox B, Bromax)

<1%

1%

graph showing detections

Bromoxynil (Buctril, Brominal, Torch)

<1%

0%

graph showing detections

Butylate (Sutan, Genate Plus, butilate)

<1%

0%

graph showing detections

Chloramben (Amiben, Vegiben)

<1%

0%

graph showing detections

Clopyralid (Stinger, Lontrel, Dowco 290)

1%

0%

graph showing detections

Cyanazine (Bladex, Fortrol)

5%

0%

graph showing detections

2,4-D (2,4-PA)

17%

2%

graph showing detections

DCPA (Dacthal, chlorthal-dimethyl)

<1%

<1%

graph showing detections

Dacthal, mono-acid (Dacthal metabolite)

<1%

0%

graph showing detections

Dicamba (Banvel, Mediben, dianat)

1%

0%

graph showing detections

Dichlorprop (2,4-DP, Seritox 50, Kildip)

3%

0%

graph showing detections

Dinoseb (DNBP, DN 289, Premerge, Aretit)

1%

0%

graph showing detections

Diuron (Karmex, Direx, DCMU)

7%

0%

graph showing detections

EPTC (Eptam)

1%

0%

graph showing detections

Fluometuron (Flo-Met, Cotoran)

17%

0%

graph showing detections

Linuron (Lorox, Linex, Sarclex)

1%

0%

graph showing detections

MCPA (Agritox, Agroxone)

3%

0%

graph showing detections

MCPB (Can-Trol, Thistrol, Tropotox)

<1%

0%

graph showing detections

Metolachlor (Dual, Pennant)

69%

0%

graph showing detections

Metribuzin (Lexone, Sencor)

10%

2%

graph showing detections

Molinate (Ordram)

18%

0%

graph showing detections

Napropamide (Devrinol)

<1%

0%

graph showing detections

Neburon (Neburex, Noruben, Kloben)

<1%

0%

graph showing detections

Oryzalin (Surflan, Dirimal, Ryzelan)

3%

0%

graph showing detections

Pendimethalin (Prowl, Stomp)

10%

0%

graph showing detections

Picloram (Tordon, Amdon)

1%

0%

graph showing detections

Prometon (Gesa­gram, prometone)

50%

4%

graph showing detections

Pronamide (Kerb, propyzamid)

2%

0%

graph showing detections

Propachlor (Ramrod, propachlore)

1%

0%

graph showing detections

Propanil (Stampede, Surcopur)

5%

0%

graph showing detections

Propham (Chem-Hoe, IPC, prophame)

1%

0%

graph showing detections

Simazine (Aquazine, Princep, Gesatop)

63%

<1%

graph showing detections

Tebuthiuron (Spike, Perflan)

42%

2%

graph showing detections

Thiobencarb (Bolero, Saturn, benthiocarb)

8%

0%

graph showing detections

Triclopyr (Garlon, Grazon, Crossbow)

1%

0%

graph showing detections

Trifluralin (Treflan, Trinin, Elancolan)

3%

0%

graph showing detections


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 counting only detections equal to or greater than 0.01 mg/L to facilitate equal comparisons among compounds, which had widely varying detection limits. For herbicides and insecticides, a detection rate of "<1%" means that all detections are less than 0.01 mg/L, or the detection rate rounds to less than 1%. For other compound groups, all detections were counted and minimum detection limits for most compounds were similar to the lower end of the national ranges shown. Method detection limits for all compounds in these tables 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 mg/L; if the tentative cancer classification C is accepted, the lifetime health advisory will be 20 mg/L (Gilliom and others, in press). 

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