12 
PPM--DRY WEIGHT 
HEPTACHLOR, 

: iyi \ ie ee ees 
> WAALS 
p Oo i / 
eo b ae ae 
K\ \ s, 
\ \ “ 
y /\ 3 = 
\ \ “ | 
\ ~ } 
5 \ \ < 
* | ~ AR 
.O1 \ \ j \ _ 
i 
68 D 
- A Q , f e rae. / 
S \ £ i of 7\ —/ ar / P 
WER ok Oe te ps, te 
z RV / \ SH wy 2 \ LA SY a 6 
J Xu Ne Be z \ ‘ / 
2 b < —_— ae 
Pays Leon \ Tae e i \/ Shy . / 
: WR. ne: 
‘ / ce 
O SS 4s 
= 4 o 
© + 8 «+12 16 20 24 : m 4 8 12 16 20 24 
TIME SINCE APPLICATION, MONTHS 
Fig. 4. Mean quantities of heptachlor (A), heptachlor epoxide (B), y-chlordane (C), and heptachlor, heptachlor epoxide, 
a-chlordane, + y-chlordane (D) in soils (solid lines) and earthworms (broken lines) at various times following a single application of 
25% wettable powder heptachlor at 0.56 (circles), 2.24 (squares), or 8.97 (triangles) kg ai/ha, 
