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Field sampling and sample preparation ----------- 
Grain-size analysis techniques ------------------- 
Trace-metal analysis procedures ------------------ 
Preparation of stock solution A -------------- 
Preparation of stock solution B -------------- 
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Aluminum, iron, chromium, nickel, and vanadium 
Lead, copper, and c 
Manganese and zine ------------------------ 
Mercury ---------------------------------- 
Additional methods 
CONTENTS 
y 
rs 
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Analytical accuracy and precision ---------------- 
Results and discussion ------------------------- 
Sediment texture --------------------------- 
Trace metals in bulk sediments --------------- 
Trace metals in the fine fraction of sediment --- 
Trace metals in different size fractions of sediment 
Trace-metal concentrations of sediment-trap samples 
Trace-metal variations with depth in sediment -- 
Barium inventory and decrease at block 312 ---- 
Summary of important findings ------------------ 
Recommendations for future work ---------------- 
References cited ------------------------------- 
Appendix tables ------------------------------- 
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ILLUSTRATIONS 
FIGURE 1. Map and diagram showing regional sampling stations and site-specific sampling stations around regional 
station 5 ----------=--— === nn 
2-21. Graphs showing: 
2. 
3. 
4. 
5. 
Ul, 
12. 
Mean grain size of samples collected during years 1, 2, and 3 -------------------------- 
Percent silt plus clay in samples collected at each regional station during years 1, 2, and 3 - 
Concentrations of barium in bulk sediment at upstream control stations on different sampling 
occasions ------------------------------ === === == === 5 = 
Concentrations of barium and chromium in bulk sediment on different sampling occasions near 
the drill site at block 410 -------------------------------~---~--------~-------- 
Concentrations of barium and chromium in bulk sediment on different sampling occasions near 
the drill site at block 312 -------------------------------------~-------------- 
Concentrations of barium and chromium in the fine fraction on different sampling occasions near 
the drill site at block 410 ------------------------------~---------~----------- 
Concentrations of barium and chromium in the fine fraction on different sampling occasions near 
the drill site at block 312 --------------------------------------------------- 
Concentrations of barium and the ratio of barium to aluminum in the fine fraction of sediment 
blends on different sampling occasions at stations 2, 3, 10, and 12 ---------------- 
Weight percent of sediment in different size fractions of bottom sediment collected on cruises 
4 and 10 at three locations on Georges Bank ---------------------------------- 
Relative amount of total barium and concentrations of barium in different size fractions of bot- 
tom sediments collected on cruises 4 and 10 at control station 2 on Georges Bank -- 
Relative amount of total barium and concentrations of barium in different size fractions of bot- 
tom sediments collected on cruises 4 and 10 at site-specific station 5-2 on Georges Bank 
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