Table
1. Concentrations of selected
organochlorine compounds and major and trace elements in the Llano Grande Lake
sediment core
[See text for additional compounds not
detected; cm, centimeters; mg/kg,
micrograms per kilogram; <, less than; E, estimated; --, unknown or not
applicable; TEC, Threshold Effect Concentration (MacDonald and others, 2000);
PEC, Probable Effect Concentration (MacDonald and others, 2000); mg/kg,
milligrams per kilogram]
|
Core |
Esti- |
Organochlorine compounds |
||||||||||
|
Dieldrin |
DDE |
DDD |
DDT |
Total |
PCB |
PCB |
PCB |
Total |
Chlor- |
Toxa- |
||
|
0–4 |
2001 |
1.0 |
49 |
<1.0 |
1.5 |
51 |
<10 |
<10 |
<10 |
<30 |
<10 |
<100 |
|
4–8 |
2001 |
E.4 |
34 |
<.5 |
.8 |
35 |
<5.0 |
<5.0 |
<5.0 |
<15 |
<5 |
<50 |
|
8–12 |
2000 |
<.5 |
25 |
<.5 |
<.5 |
25 |
<5.0 |
<5.0 |
<5.0 |
<15 |
<5 |
<50 |
|
12–16 |
1999 |
E.5 |
90 |
<.8 |
E1.2 |
90 |
<5.0 |
<5.0 |
<5.0 |
<15 |
<5 |
<50 |
|
24–28 |
1997 |
E.2 |
72 |
<.5 |
.9 |
73 |
<5.0 |
<5.0 |
<5.0 |
<15 |
<5 |
<50 |
|
36–40 |
1994 |
.5 |
120 |
<.6 |
1.4 |
121 |
<5.0 |
<5.0 |
<5.0 |
<15 |
<5 |
<50 |
|
48–52 |
1992 |
E.4 |
100 |
<.6 |
1.1 |
101 |
<5.0 |
E3.5 |
E2.2 |
E5.7 |
<5 |
<50 |
|
60–64 |
1989 |
E.3 |
98 |
<.5 |
1.0 |
99 |
<5.0 |
E4.4 |
E2.5 |
E6.9 |
<5 |
<50 |
|
72–76 |
-- |
<.5 |
37 |
<.5 |
<.5 |
37 |
<5.0 |
<5.0 |
<5.0 |
<15 |
<5 |
<50 |
|
84–90 |
-- |
E.3 |
120 |
<.5 |
1.0 |
121 |
<5.0 |
E4.7 |
E2.6 |
E7.3 |
<5 |
<50 |
|
102–108 |
-- |
E.4 |
110 |
<.6 |
1.3 |
111 |
<5.0 |
E8.1 |
E3.3 |
E11.4 |
<5 |
<50 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
TEC |
-- |
1.9 |
3.2 |
4.9 |
4.2 |
5.3 |
-- |
-- |
-- |
59.8 |
3.24 |
-- |
|
PEC |
-- |
61.8 |
31 |
28.0 |
62.9 |
572 |
-- |
-- |
-- |
676.0 |
17.6 |
-- |
|
Core |
Estimated |
Major
elements |
|||||||
|
Aluminum |
Calcium |
Iron |
Potas- |
Mag- |
Sodium |
Phos- |
Titanium |
||
|
0–4 |
2001 |
59,100 |
131,500 |
28,300 |
16,400 |
11,850 |
4,675 |
1,270 |
2,860 |
|
12–16 |
2001 |
60,200 |
114,000 |
27,300 |
17,400 |
10,800 |
5,880 |
1,200 |
3,030 |
|
24–28 |
2000 |
58,200 |
121,000 |
27,300 |
16,800 |
10,100 |
5,720 |
1,550 |
2,970 |
|
36–40 |
1999 |
59,600 |
118,000 |
28,000 |
17,100 |
10,400 |
5,920 |
1,380 |
3,040 |
|
48–52 |
1997 |
61,300 |
114,000 |
28,700 |
17,700 |
10,600 |
5,800 |
1,240 |
3,160 |
|
60–64 |
1994 |
62,400 |
114,000 |
29,500 |
17,500 |
11,300 |
5,120 |
1,290 |
3,050 |
|
72–76 |
1992 |
60,600 |
119,000 |
29,200 |
17,400 |
10,600 |
4,940 |
1,380 |
3,120 |
|
84–87 |
1989 |
58,000 |
127,000 |
28,100 |
16,400 |
10,200 |
4,550 |
1,320 |
2,920 |
|
93–96 |
-- |
63,000 |
110,000 |
28,400 |
17,300 |
10,600 |
5,220 |
1,010 |
3,140 |
|
102–105 |
-- |
55,267 |
135,333 |
25,600 |
16,067 |
9,813 |
5,443 |
1,163 |
2,840 |
|
111–114 |
-- |
43,100 |
184,000 |
20,600 |
12,200 |
8,620 |
4,980 |
1,060 |
2,210 |
|
Core |
Estimated |
Trace
elements |
|||||||
|
Arsenic |
Cadmium |
Chro- |
Copper |
Nickel |
Lead |
Zinc |
Organic |
||
|
0–4 |
2001 |
9.1 |
0.39 |
41 |
21 |
21 |
17 |
93 |
1.3 |
|
12–16 |
2001 |
9.3 |
.39 |
40 |
20 |
21 |
19 |
92 |
.79 |
|
24–28 |
2000 |
8.4 |
.42 |
42 |
23 |
21 |
22 |
94 |
.83 |
|
36–40 |
1999 |
8.7 |
.43 |
42 |
21 |
21 |
22 |
95 |
.90 |
|
48–52 |
1997 |
9.1 |
.44 |
44 |
22 |
21 |
24 |
97 |
.86 |
|
60–64 |
1994 |
9.3 |
.46 |
44 |
23 |
22 |
25 |
102 |
.89 |
|
72–76 |
1992 |
9.2 |
.46 |
45 |
24 |
22 |
25 |
99 |
.86 |
|
84–87 |
1989 |
10.0 |
.43 |
43 |
23 |
21 |
22 |
92 |
.93 |
|
93–96 |
-- |
9.7 |
.42 |
45 |
21 |
21 |
23 |
95 |
.81 |
|
102–105 |
-- |
9.0 |
.38 |
40 |
19 |
20 |
22 |
85 |
.83 |
|
111–114 |
-- |
7.9 |
.29 |
33 |
32 |
18 |
16 |
68 |
.90 |
|
|
|
|
|
|
|
|
|
|
|
|
TEC |
-- |
9.8 |
.99 |
43.4 |
31.6 |
22.7 |
35.8 |
121 |
-- |
|
PEC |
-- |
33.0 |
4.98 |
111 |
149 |
48.6 |
128 |
459 |
-- |