diff --git a/convert_barite.jl b/convert_barite.jl
index 6830d32..d57df53 100755
--- a/convert_barite.jl
+++ b/convert_barite.jl
@@ -48,6 +48,12 @@ for file in qs_files
     # Load the RDS file
     data = qs_read(file)
 
+    # get basename of the file
+    basename = split(file, "/")[end]
+
+    # get the iteration number by splitting the basename and parse the second element
+    iteration = parse(Int, split(split(basename, "_")[2], ".")[1])
+
     @rput data
 
     R"transport <- data$T"
@@ -56,6 +62,10 @@ for file in qs_files
     @rget transport
     @rget chemistry
 
+    # Add iteration number to the DataFrame
+    transport.iteration = fill(iteration, size(transport, 1))
+    chemistry.iteration = fill(iteration, size(chemistry, 1))
+
     # Append the DataFrame to the big DataFrame
     append!(df_design, transport)
     append!(df_result, chemistry)