Assessment of Phenolic Compounds in Surface Waters from New Calabar River and Orashi River in the Niger Delta Region of Nigeria

Phenolic compounds are hazardous with diverse health implications. The presence of phenolic compounds in rivers is triggered by several activities including petroleum products. The Niger Delta is one of the world’s major hydrocarbon provinces with several health hazards created by oil exploration and exploitation and slow in action to oil spillages. Therefore this paper assessed phenolic compounds in surface waters from New Calabar River and Orashi River in the Niger Delta Region of Nigeria using GC/MS technique (Agilent 6890N Gas agilent 5975 mass selective Detector). Data obtained reveal that the average phenolic compounds recorded during the dry and wet seasons were 37.7156μg/l and 37.5878μg/l for New Calabar River and 94.3078μg/l and 85.5222μg/l for Orashi River, respectively. The level of phenolic compounds in the water samples indicated that both rivers were contaminated and not suitable for domestic use. Therefore, the people located within the riverbank, particularly Orashi River, are advised not to use the river water domestically except after treatment

Recikliranje ekspandiranog polistirena kao učinkovitog adsorbensa naftalena iz vodene otopine

Batch adsorption process factors [contact time (20–150 min), adsorbent dosage (0.5–1.5 g), adsorbate concentration (5–30 mg l–1), and agitation rate (100–250 rpm)] were optimised based on D-optimal Design under the Response Surface Methodology (RSM) of the Design-Expert Software (7.6.8) for the removal of naphthalene from aqueous solution using adsorbent developed from Acetylated Waste Expanded Polystyrene (AWEPs). The maximum adsorption capacity (5.6608 mg g–1) achieved was well fitted to Dubinin-Radushkevich Isotherm (R2 = 0.9949). The SSE (< 0.05) and ARE (< 4.0 %) indicated pseudo-second-order as the most suitable model. This research has demonstrated the effectiveness of the WEPs for the removal of naphthalene from the aqueous solution. This work is licensed under a Creative Commons Attribution 4.0 International License.Šaržni faktori procesa adsorpcije [vrijeme kontakta (20 – 150 min), doziranje adsorbenta (0,5 – 1,5 g), koncentracija adsorbata (5–30 mg l–1) i brzina miješanja (100–250 min–1)] optimizirani su na temelju D-optimalnog dizajna primjenom metodologije odzivne površine (RSM) programa Design-Expert (7.6.8) za uklanjanje naftalena iz vodene otopine pomoću adsorbenta razvijenog iz acetiliranog otpadnog ekspandiranog polistirena (AWEP). Ostvareni maksimalni adsorpcijski kapacitet (5,6608 mg g–1) dobro je prilagođen izotermi Dubinin-Radushkevich (R2 = 0,9949). SSE (< 0,05) i ARE (< 4,0 %) označili su pseudo-drugi red kao najprikladniji model. Ovo istraživanje pokazalo je učinkovitost WEP-a za uklanjanje naftalena iz vodene otopine. Ovo djelo je dano na korištenje pod licencom Creative Commons Imenovanje 4.0 međunarodna