Corrections

In the article, “Kinetics of Limestone Neutralization of Acid Waters” [Enuiron. Sci. Technol., 10,262-6 (1976)], by Paul Barton* and Terdthai Vatanatham, the following corrections should be made.

In the Abstract on page 262, starting on line 3, lop4 1./ (cmI2(s) should be 6 X l./(cm)2(s). Equation 10 on page 263 should be:

(10)

Corrected versions of Figure 4 on page 264 and Tables I, 11, and I11 on page 265 are presented here.

In the first and second lines of paragraph 3 on page 265, 0.0095 mm should be 0,015 mm and 4% should be 6%. In paragraph 5 on page 265, lines 4,5, and 6,3.5 X I./(cm)2(s)

0 250 - 0 297 mm limestone 2982 O K

1 2

I o I

s I I I I I 1

1 2 3 4 5 6 7 8

PH

Figure 4. Variation of rate constant with pH for hydrogen ion first order

Table I. Rate Constants for Hydrogen Ion First Order at Different Limestone Particle Sizes

(temperature, 298.2 K) particle size, mm pH range k , I./(cmP(s)

0.037-0.044 2.00-5.85 6.65 x 10-5 0.063-0.074 2.09-6.00 9.00 x 10-5 0.125-0.149 2.00-5.3 1 5.78 x 10-5 0.250-0.297 1.92-6.18 6.43 x 10-5 0.500-0.595 1.92-6.15 7.15 x 10-5

Table II. Effect of Temperature on Rate Constant for Hydrogen ion First Order

(0.250-0.297 mm of limestone) apparent

temp, film thick- K pH range k , I.l(cm)2(s) ness, mm

273.6 1.90-6.51 2.99 x 10-5 0.0185 298.2 1.92-6.18 6.43 x 10-5 0.0145 323.2 2.05-5.85 9.84 x 105 0.0136 347.6 2.34-5.60 1.21 x 10-4 0.0142

av 0.0152

Table 111. Effect of Carbon Dioxide Partial Pressure on Rate Constant for Hydrogen Ion First Order

(Temperature, 298.2 K; 0.250-0.297 mm limestone) Pcop mmHg pH range k , I./(cm)2(s) -

6.90 x 10-5 170- 188 2.02-5.10 6.70 x 10-5

712 1.92-5.22 8.12 x 10-5

0-3 2.03-6.28

should be 2.3 X lop5 l./(cm)2(s), 0.027 mm should be 0.041 mm, and 10% should be 15%. In paragraph 6 on page 265, lines 3 and 4, 10-5 l./(cm)2(s) should be 1.6 X

The above changes slightly improve the fit of the data to the model presented. The assistance of Gennaro Volpicelli, Lu- ciano Santoro, and Paolo Ciambelli of the University of Na- poli, Naples, Italy, who recently found an error in the com- puter program in Vatanatham’s thesis, is appreciated.

l./(cm)2(s).

In the article, “Water Distribution System, a New Source of Mutagens in Drinking Waters” [Enuiron. Sci. Technol., 13, 1138-41 (1979)], by David J. Schwartz, Jitendra Saxena*, and Frederick C. Kopfler, there is an error in Table I on page 1139. The codes used to designate the water supply systems in the table are different than those used in the text. In column one of Table I, the supply system codes A, B, and C should be changed to WH, AP, and CH, respectively.

In the article, “Kinetics of the Chlorination of Biphenyl under Conditions of Waste Treatment Processes” [Enuiron. Sci. Technol., 13, 1244-8 (1979)], by Eric H. Snider* and F. C. Alley, there is an error in Table I on page 1245. The heading for the second column should read [HOClt]: mg L-I, not [HOClt], pg L-I as printed.

1420 Environmental Science & Technology 0013-936X/79/0913-1420$01 .OO/O @ 1979 American Chemical Society