US EPA

1198245 

Journal Article 

SOLID-PHASE EXTRACTION OF ORGANOTIN COMPOUNDS IN SEAWATER 

Kohri, M; Inoue, Y; Ide, K; Sato, K; Okochi, H 

1994 

1 

Bunseki Kagaku / Analysis Chemistry
ISSN: 0525-1931 

JAPAN SOC ANALYTICAL CHEM 

TOKYO 

43 

11 

933-938 

WOS:A1994PX21100017 

For the speciation of ultra trace organotin compounds, a technique for separation and preconcentration, such as organic solvent extraction, is useful. However, a solid phase extraction (SPE) is preferable from the viewpoint of environmental pollution. The SPE of comparatively large amounts of organotin compounds in seawater has been developed using a polymer of styrene derivative/metacrylic ester as a solid phase sorbent. The sorbent (500 mg) was put into a 8 ml reservior. Recovery of organotin was measured by AAS. In pure water containing organotin compounds (TBT, TPT) there was almost 100% recovery in the range of pH 0.25 similar to 8.0, while in the 2.45% sodium chloride solution (equivalent to the sodium chloride content in seawater) the recoveries decreased to about 50 similar to 60%. This problem was resolved by adding methanol. To prepare sample solutions, methanol was added to be 50% (v/v), in artificial seawater samples containing organotin standard solutions and the pH was adjusted to 0.5 with nitric acid. The water samples were forced through the cartridge at a flow rate of 4.5 similar to 5.0 ml min(-1). Elution was by gravity flow of 10 ml methanol. Recoveries of TPT and TBT were more than 90%, while those of DPT and DBT were about 30 and 60%, respectively. 

SOLID PHASE EXTRACTION OF ORGANOTIN; ORGANOTIN COMPOUNDS IN SEAWATER; POLYMER OF STYRENE DERIVATIVE METACRYLIC ESTER AS A SOLID PHASE SORBENT; AAS OF TIN