Appendix D to Part 136 - Precision and Recovery Statements for Methods for Measuring Metals
40:25.0.1.1.1.0.1.8.4 : Appendix D
Appendix D to Part 136 - Precision and Recovery Statements for
Methods for Measuring Metals
Two selected methods from “Methods for Chemical Analysis of
Water and Wastes,” EPA-600/4-79-020 (1979) have been subjected to
interlaboratory method validation studies. The two selected methods
are for Thallium and Zinc. The following precision and recovery
statements are presented in this appendix and incorporated into
Part 136:
Method 279.2
For Thallium, Method 279.2 (Atomic Absorption, Furnace
Technique) replace the Precision and Accuracy Section statement
with the following:
Precision and Accuracy
An interlaboratory study on metal analyses by this method was
conducted by the Quality Assurance Branch (QAB) of the
Environmental Monitoring Systems Laboratory - Cincinnati (EMSL-CI).
Synthetic concentrates containing various levels of this element
were added to reagent water, surface water, drinking water and
three effluents. These samples were digested by the total digestion
procedure, 4.1.3 in this manual. Results for the reagent water are
given below. Results for other water types and study details are
found in “EPA Method Study 31, Trace Metals by Atomic Absorption
(Furnace Techniques),” National Technical Information Service, 5285
Port Royal Road, Springfield, VA 22161 Order No. PB 86-121 704/AS,
by Copeland, F.R. and Maney, J.P., January 1986.
For a concentration range of 10.00-252 µg/L
X = 0.8781(C) − 0.715 S = 0.1112(X) + 0.669 SR = 0.1005(X) + 0.241
Where: C = True Value for the Concentration, µg/L X = Mean
Recovery, µg/L S = Multi-laboratory Standard Deviation, µg/L SR =
Single-analyst Standard Deviation, µg/L Method 289.2
For Zinc, Method 289.2 (Atomic Absorption, Furnace Technique)
replace the Precision and Accuracy Section statement with the
following:
Precision and Accuracy
An interlaboratory study on metal analyses by this method was
conducted by the Quality Assurance Branch (QAB) of the
Environmental Monitoring Systems Laboratory - Cincinnati (EMSL-CI).
Synthetic concentrates containing various levels of this element
were added to reagent water, surface water, drinking water and
three effluents. These samples were digested by the total digestion
procedure, 4.1.3 in this manual. Results for the reagent water are
given below. Results for other water types and study details are
found in “EPA Method Study 31, Trace Metals by Atomic Absorption
(Furnace Techniques),” National Technical Information Service, 5285
Port Royal Road, Springfield, VA 22161 Order No. PB 86-121 704/AS,
by Copeland, F.R. and Maney, J.P., January 1986.
For a concentration range of 0.51-189 µg/L
X = 1.6710(C) + 1.485 S = 0.6740(X) − 0.342 SR = 0.3895(X)− 0.384
Where: C = True Value for the Concentration, µg/L X = Mean
Recovery, µg/L S = Multi-laboratory Standard Deviation, µg/L SR =
Single-analyst Standard Deviation, µg/L [77 FR 29833, May 18, 2012]