Seawater - chemistry, Water Purification - methods, Marine Toxins - analysis, Kainic Acid - analogs & derivatives, Kainic Acid - analysis, Marine Toxins - chemistry, Oxocins - chemistry, Okadaic Acid - chemistry, Okadaic Acid - analysis, Saxitoxin - chemistry, Saxitoxin - analysis, Kainic Acid - chemistry, Oxocins - analysis