Now you can read out changes in
ha ppening.
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Two minutes after a sample is injected automatically or manually, the Beckman Carbonaceous Analyzer delivers an accurate Total Organic Carbon measurement that you can relate to BOD, COD and other criteria. There’s no faster valid way to obtain operational data. Put time on your side in the fight to prevent pollution. Write for Data File PC-16-167.
I NSTR U M ENTS, I NC. SCIENTIFIC AND PROCESS INSTRUMENTS DIVISION FULLERTON. CALIFORNIA
92634
I N T E R N A T I O N A L S U B S I D I A R I E S G E L E I ’ I . MUhICH: G L E N R X H E S , SCOTLAND: TOKYO; PARIS. CADETCYI’N, LONCON; MEXICO CITY
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516
Environmental Science and Technology
LETTERS Lake Erie Again
DEARSIR: We all know that if phosphorus could be completely eliminated from the waters of Lake Erie, we would not have the algal problem nor, eventually, oxygen depletion. We feel, however, that the problem is much more complicated and there are other factors involved than simply phosphorus input. I refer to the possible “regeneration” of phosphates from the bottom muds under anaerobic conditions. We are attempting to measure the fate of the increased phosphorus that occurs under anaerobic conditions after the waters of the lake are mixed. We are also attempting to measure the nutrient requirements of the algae common to Lake Erie to determine what nutrients are limiting and what nutrients are in excess. We have some data to show that the phosphorus level in the central basin of Lake Erie does not vary with plankton density. We also have data that show nitrates disappearing from the surface waters of Lake Erie during plankton blooms. These studies have many ramifications and we d o not wish to make our findings known until we have more conclusive evidence to indicate nitrates indeed become limiting before phosphorus. We have found this to be true only for certain forms of algae, namely diatoms and green algae, since certain species of bluegreens can manufacture their own nitrogen. Let me put our position in this way. We wholeheartedly agree with the steps FWPCA is taking to improve conditions in Lake Erie. We favor maximum treatment for all wastes. We favor maximum phosphorus removal and believe that these steps will have a measurable influence on Lake Erie. Our concern is that these measures will not go far enough to satisfy the environmental requirements of the biota of Lake Erie and are suggesting a n increase in research activities to pinpoint problem areas and to answer specific questions concerning the role of various nutrients in the metabolism of Lake Erie. John F. Carr Chief, Limnology Program U. S . Department of the Interior Ann Arbor, Mich. 48107
if you have an industrial waste pollution problem .
has the answer! Many industrial companies find that the injection of wastes into a disposal well has provided a permanent, low-cost solution to their problenl. This is known as “deep-well” waste disposal. IDCI combines the 25 years of drilling experience of Lohmann-Johnson Drilling with the geological and en ineering know-how of Mitchell a n d Stanonis, Inc. into an organization capable of providing: 0 Geological feasibility studies
for injection in your phnt area 0 Studies t o detennhe the necessary pre-injection surface treatment of your material 0 Engineering design and contract installation of the entire surface and subsurface systems 0 Continued supervision of the operation and maintenance of the fluid injection system For mnre information, write (on your Cornpany lettrrhead please) to International Disposal Contraftors Inc., 355 Permnnent Savings B M ~ . ~v&ville, , I n h a . 47708. Or phone (812) 425-1349.
Suite 355 Permanent Savin& BId&.Evansville, Indiana 47708 BRANCH OFFICES 1906 Clark Bldg. wonhinpton. 881 High S uohlo ed
PitbbvRh, Po. 15228
740 Eluedm House Calgary. Alberta. Canada
1734 Wiohlb ?lam Bld5 wichltl. XMIM
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