Desorption Kinetics of Benzene in a Sandy Soil in the Presence of Powdered Activated Carbon

Abstract

A technique was developed to measure the total gaseous phosphorus content in biogas. The amount of air needed for a neutral to oxidising flame was mixed with the biogas. The gas mixture was burnt in a closed quartz burner and the combustion gasses were bubbled through a nitric acid solution. The phosphate content in the bubbling liquid was determined with sector field ICP-MS. The technique was validated in the lab with phosphine. Afterwards the set-up was installed on a landfill. The total gaseous phosphorus content in the landfill gas, measured with the combustive technique, ranged from 1.65 to 4.44 µg P/m 3 . At the same time the phosphine concentration in the landfill gas was determined gas chromatographically (GC). The phosphine (PH 3 ) content measured with GC ranged from 7.6 to 16.7 µg PH 3 -P/m 3 . Since the phosphine-P content (GC) was consistently higher than the total gaseous phosphorus content (burner/ICP-MS), the hypothesised presence of highly toxic gaseous phosphorus compounds other than phosphine could not be demonstrated.

Assessing the Phytoavailability of Dieldrin Residues in Charcoal-Amended Soil Using Tenax Extraction

“…One option to reduce OCP uptake by crop plants from polluted soils is to immobilize the pesticides by adding binding agents. In particular, activated carbon (AC) has been proposed to immobilize organic contaminants in soils , . More specifically, this approach was also applied to horticultural soils with OCP residues , .…”