DISTRIBUTION OF ABS (ALKYLBENZENESULFONATE) IN THE BOTTOM MUDS OF LAKE SUWA
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The distribution of the contents of ABS (alkylbenzenesulfonate) and of MBAS (methylene blue active substances) in the bottom mulls were investigated in Lake Suwa. <BR>MBAS was extracted from the dried mud with methanol-benzene mixture as a solvent, and, after being solved in the water, its concentration was determined by methylene blue colorimetry. From the infrared spectrum of the MBAS-MB complex, the ratio of ABS to MBAS was determined, and then multiplying the conent of MBAS obtained above with ABS/MBAS, the content of ABS in the lake mud was given. <BR>As shown in Fig. 2 the contents of MBAS in the lake mulls were higher in the northern part of the lake, particularly, near the coast of Suwa City, and it was rather low in the southern part. The value of ABS/MBAS ranged from nearly zero to about 0.5. The higher value was found also in the region along the coast of Suwa City, and along the coast of Okaya City though not so high. <BR>From the two patterns mentioned above, the distribution of ABS content in the bottom mud was obtained (Fig. 4). <BR>The concentration of ABS was higher in the north-eastern part of the lake and along the coast of Okaya City. In the region near the coast of Suwa City in particular, there are found very high values which reflect the pollution by the inflowing urban waste waters. Such values of ABS in the muds are considered as a result that ABS absorbed suspended matters in the polluted river waters have deposited immediately after inflowing the lake. <BR>It was also estimated from the above data that a part of non-ABS-MBAS in the bottom muds in the central part of this lake were derived from the decomposed dead plankton.
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