modeling phosphorus using TP data

Sorry if this is a green horn question, but I'm wondering how to input TP data into CE-QUAL? Some CE-QUAL studies present results for PO-4 and others TP, but I cannot find which CE-QUAL constituent name refers to TP (this is the only data I have). These are the CE-QUAL constituent names related to P: PO4 (Inorganic dissolved phosphorus) LDOM_P (Total P in labile dissolved organic matter) RDOM_P (Total P in refractory dissolved organic matter) LPOM_P (Total P in labile particulate organic matter) RPOM_P (Total P in refractory particulate org matter) Any help would be appreciated, Ray