chemical oxygen demand
type: Concept
preferred label: نیاز‌شیمیایی به اکسیژن @fa
related: biochemical oxygen demand

biochemical oxygen demand
type: Concept
alternative label: BOD
broader: pollution indicators
preferred label: نیاز زیست شیمیایی به اکسیژن @fa
related: chemical oxygen demand
related: effluents

pollution indicators
type: Concept
narrower: biochemical oxygen demand
preferred label: شاخص‌های آلودگی @fa

effluents
type: Concept
preferred label: پس‌آب‌ها @fa
related: biochemical oxygen demand