Skip to main content

Table 7 Human toxicology and environmental persistence data for hexazinone and terbuthylazine (Tomlin, 2006 )

From: A survey of herbicide use and a review of environmental fate in New Zealand planted forests

Herbicide

DT50a

ADIb

Kowc

Kocd

Kdd

Solubilityemg L-1

LD50

LC50(96 h)

LC50(48 h)

LC50(14 day)

BCFh

 

days

mg kg-1bw

logP

mL g-1

mL g-1

 

(rats)fmg kg-1

(trout)g mg L-1

(Daphnia)g mg L-1

(earthworms)gmg kg-1

(potential)

terbuthylazine

30-60

0.004

3.2

162-278

2.2-2.5

8.5

1590

3.8-4.6

21-50.9

141.7

34 (low)

hexazinone

30-180

0.05

1.2

54

0.2

29800

860

>320

442

na

7 (low)

  1. a The rate of degradation of pesticides in soils is often expressed as the half-life (DT50), in years, months or days (Tomlin 2006).
  2. b The Acceptable Daily Intake (ADI) value is the maximum quantity of chemical that humans can absorb in a day for their entire lifespan without showing any signs of illness (Tomlin 2006). bw = body weight.
  3. c The octanol-water partition coefficient (Kow) is the ratio of the concentration of a chemical in octanol and in water at equilibrium.
  4. d The soil organic carbon (OC) affinity coefficient (Koc) represents the soil distribution coefficient (Kd) normalised for soil organic carbon content.
  5. e Solubility in water.
  6. f The LD50 is the dose that kills half (50%) of the animals tested (LD = “lethal dose”) (Tomlin, 2006).
  7. g The Acute LC50 (hours) is the concentration in water that kills half (50%) of the animals tested (LC = “lethal concentration”) (Tomlin 2006).
  8. h BCF-bio-concentration factor; taken from the Pesticide Properties Database (PPDB), University of Herdfordshire. http://sitem.herts.ac.uk/aeru/footprint [accessed January 2013].
  9. na: indicates data were not available.