Acid precipitation - ACS Publications

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ES&T LETTERS

Correction In the "Destroying hazardous wastes" article (ES&T, Vol. 15, No. 11, 1981, p. 1268) David Wimert of the ACS Department of Public Affairs assisted with the survey. His name was misspelled in the article.

Acid precipitation Dear Sir: In reference to the article "Acid precipitation" (ES&T, Vol. 15, No. 10, p. 1119), I find it incomprehensible that basic (high pH) air pollutants aren't considered. Since the 1960s and 1970s, when the EPA forced cement manufacturing companies to install dust collectors, the air has been "cleaned" of 10 million

tons/y of pollutants that formerly neutralized acidic substances in the air, on the ground, or in our lakes. The fact that the lowest pH regions in the country are just east of the locations of highest concentration of cement plants suggests an immediate remedy, especially since no one has ever shown cement plant emissions to be anything but a nuisance. William G. Hime Vice President Erlin, Hime Associates, Inc. 811 Skokie Boulevard Northbrook, Ill. 60062

Raymond C. Loehr Liberty Hyde Bailey Professor of Engineering

FOR THE 13 th CONSECUTIVE YEAR...

1982 STACK

SAMPLING SEMINARS

Conducted by Walter S. Smith, P.E., President, Entropy Environmentalists, Inc., Research Triangle Park, North Carolina. Mr. Smith was formerly employed by the United States EPA where he co-developed and coauthored EPA Test Methods 1-8, the basis for all stationary emissions sampling. For complete information, including registration fees, contact Mr. Rob Ford, National Sales Manager, at the address or phone number listed.

Call Toll Free 800-638-9566

1 9 8 2 S E M I N A R SCHEDULE

Two Day Technical Seminars The RAC 2 day technical seminars provide a basic understanding of the necessary procedures involved in the complicated art of sampling. Month February April June August October December

Date 4-5 1-2 3-4 5-6 7-8 2-3

Location Orlando, FL New Orleans, LA Las Vegas, NV San Francisco, CA Denver, CO Pittsburgh, PA

Five Day "Hands-on " Seminars The RAC 5 day seminars offer a broad overview of sampling with "hands-on" experiences. Month February May

Date 22-26 17-21

Location Raleigh, NC Raleigh, NC

Sponsored by

RAC

RESEARCH APPLIANCE C O M P A N Y P.O. Box 265, M o o s e Lodge Road C a m b r i d g e , M D . 21613 - 301 -228-9505

® CIRCLE 11 ON READER SERVICE CARD Environ. Sci. Technol., Vol. 16, No. 1, 1982

Lewis M. Naylor, Ph.D. Research Associate Cornell University Ithaca, N.Y. 14853

Dietary cadmium Dear Sir: We wish to acknowledge and clarify the following items related

COMPLIMENTARY SLIDE RULE NOMOGRAPH

6A

to our article titled "Increase in dietary cadmium as a result of application of sewage sludge to agricultural land" ( E S & T , Vol. 15, No. 8, 1981, pp. 881-886). 1. Reference 9 was an important key document used in preparing the summary review presented in the article. 2. Table 1 in the article was taken from reference 9 and should have been so noted.