Editorial

Background and Biology
by Edward Calabrese and Paul Kostecki

Introduction

Arsenic Background Definition¹:  Introduction and Objectives
By Ed Zillioux

Contributed Papers

Arsenic background Concentrations in Florida Surface Soils: Determination and Interpretation
By Ming Chen,Lena Q. Ma, C.G. Hoogeweg, W.G. Harris

Contributions of pesticide Use to Urban Background Concentrations of Arsenic in Denver, Colorado
by David Folkes, Theodore Kuehster,and Robert Little

Protocol Development for assessing Arsenic Background Concentrations in Florida Urban Soils
ByTait Chirenje, Lene Q. Ma, A.G. Hornsby, Kenneth Portier, W. Harris, S. Latimer,and  Ed Zillioux

Statistical Issues in Assessing Anthropogenic Background for Arsenic
by Kenneth Portier

Decision Performance Curve for Arsenic in Soils: Costs of Controlling Errors in the "Gray Region".
By Patricia Cline

Conflict Resolution Associated with Background Definition: A Panel Discussion
by Ed Zillioux, Tait Chirenje, Patricia Cline, David Folkes, Randall Jones and Lena Q. Ma