diff --git a/src/envo/modules/chemical_concentration.csv b/src/envo/modules/chemical_concentration.csv
index e6edf3b8..08f9b75b 100644
--- a/src/envo/modules/chemical_concentration.csv
+++ b/src/envo/modules/chemical_concentration.csv
@@ -101,3 +101,5 @@ ENVO:3200056,,CHEBI:27007,tin,ENVO:01000406,snow
 ENVO:3200057,,CHEBI:33341,titanium,ENVO:01000406,snow
 ENVO:3200058,,CHEBI:33331,yttrium,ENVO:01000406,snow
 ENVO:3200059,,CHEBI:16199,urea,ENVO:00002006,liquid water
+ENVO:3200059,,CHEBI:18248,iron atom,ENVO:00002006,liquid water
+ENVO:3200060,,CHEBI:18248,iron atom,ENVO:00001998,soil
diff --git a/src/envo/modules/chemical_concentration.owl b/src/envo/modules/chemical_concentration.owl
index 1b9ea83a..b8e29cd2 100644
--- a/src/envo/modules/chemical_concentration.owl
+++ b/src/envo/modules/chemical_concentration.owl
@@ -153,6 +153,12 @@
     
 
 
+    <!-- http://purl.obolibrary.org/obo/CHEBI_18248 -->
+
+    <owl:Class rdf:about="http://purl.obolibrary.org/obo/CHEBI_18248"/>
+    
+
+
     <!-- http://purl.obolibrary.org/obo/CHEBI_22927 -->
 
     <owl:Class rdf:about="http://purl.obolibrary.org/obo/CHEBI_22927"/>
@@ -417,6 +423,12 @@
     
 
 
+    <!-- http://purl.obolibrary.org/obo/ENVO_00001998 -->
+
+    <owl:Class rdf:about="http://purl.obolibrary.org/obo/ENVO_00001998"/>
+    
+
+
     <!-- http://purl.obolibrary.org/obo/ENVO_00002006 -->
 
     <owl:Class rdf:about="http://purl.obolibrary.org/obo/ENVO_00002006"/>
@@ -3602,13 +3614,68 @@
                 </owl:intersectionOf>
             </owl:Class>
         </owl:equivalentClass>
+        <owl:equivalentClass>
+            <owl:Class>
+                <owl:intersectionOf rdf:parseType="Collection">
+                    <rdf:Description rdf:about="http://purl.obolibrary.org/obo/PATO_0000033"/>
+                    <owl:Restriction>
+                        <owl:onProperty rdf:resource="http://purl.obolibrary.org/obo/RO_0000052"/>
+                        <owl:someValuesFrom>
+                            <owl:Class>
+                                <owl:intersectionOf rdf:parseType="Collection">
+                                    <rdf:Description rdf:about="http://purl.obolibrary.org/obo/CHEBI_18248"/>
+                                    <owl:Restriction>
+                                        <owl:onProperty rdf:resource="http://purl.obolibrary.org/obo/BFO_0000050"/>
+                                        <owl:someValuesFrom rdf:resource="http://purl.obolibrary.org/obo/ENVO_00002006"/>
+                                    </owl:Restriction>
+                                </owl:intersectionOf>
+                            </owl:Class>
+                        </owl:someValuesFrom>
+                    </owl:Restriction>
+                </owl:intersectionOf>
+            </owl:Class>
+        </owl:equivalentClass>
+        <obo:IAO_0000115 rdf:datatype="http://www.w3.org/2001/XMLSchema#string">The concentration of iron atom when measured in liquid water.</obo:IAO_0000115>
         <obo:IAO_0000115 rdf:datatype="http://www.w3.org/2001/XMLSchema#string">The concentration of urea when measured in liquid water.</obo:IAO_0000115>
+        <oboInOwl:hasExactSynonym rdf:datatype="http://www.w3.org/2001/XMLSchema#string">liquid water iron atom concentration</oboInOwl:hasExactSynonym>
         <oboInOwl:hasExactSynonym rdf:datatype="http://www.w3.org/2001/XMLSchema#string">liquid water urea concentration</oboInOwl:hasExactSynonym>
+        <rdfs:label rdf:datatype="http://www.w3.org/2001/XMLSchema#string">concentration of iron atom in liquid water</rdfs:label>
         <rdfs:label rdf:datatype="http://www.w3.org/2001/XMLSchema#string">concentration of urea in liquid water</rdfs:label>
     </owl:Class>
     
 
 
+    <!-- http://purl.obolibrary.org/obo/ENVO_3200060 -->
+
+    <owl:Class rdf:about="http://purl.obolibrary.org/obo/ENVO_3200060">
+        <owl:equivalentClass>
+            <owl:Class>
+                <owl:intersectionOf rdf:parseType="Collection">
+                    <rdf:Description rdf:about="http://purl.obolibrary.org/obo/PATO_0000033"/>
+                    <owl:Restriction>
+                        <owl:onProperty rdf:resource="http://purl.obolibrary.org/obo/RO_0000052"/>
+                        <owl:someValuesFrom>
+                            <owl:Class>
+                                <owl:intersectionOf rdf:parseType="Collection">
+                                    <rdf:Description rdf:about="http://purl.obolibrary.org/obo/CHEBI_18248"/>
+                                    <owl:Restriction>
+                                        <owl:onProperty rdf:resource="http://purl.obolibrary.org/obo/BFO_0000050"/>
+                                        <owl:someValuesFrom rdf:resource="http://purl.obolibrary.org/obo/ENVO_00001998"/>
+                                    </owl:Restriction>
+                                </owl:intersectionOf>
+                            </owl:Class>
+                        </owl:someValuesFrom>
+                    </owl:Restriction>
+                </owl:intersectionOf>
+            </owl:Class>
+        </owl:equivalentClass>
+        <obo:IAO_0000115 rdf:datatype="http://www.w3.org/2001/XMLSchema#string">The concentration of iron atom when measured in soil.</obo:IAO_0000115>
+        <oboInOwl:hasExactSynonym rdf:datatype="http://www.w3.org/2001/XMLSchema#string">soil iron atom concentration</oboInOwl:hasExactSynonym>
+        <rdfs:label rdf:datatype="http://www.w3.org/2001/XMLSchema#string">concentration of iron atom in soil</rdfs:label>
+    </owl:Class>
+    
+
+
     <!-- http://purl.obolibrary.org/obo/PATO_0000033 -->
 
     <owl:Class rdf:about="http://purl.obolibrary.org/obo/PATO_0000033"/>