Solution Tubes 
Nextteq® distributes Nextteq® brand-labeled solution detector tubes (NXI®) as well as solution tubes manufactured by Gastec®. Solution Detector Tubes provide fast, economical, on-the-spot detection of trace chemicals in liquids. Accurate results in 5 minutes or less. Only the detector tubes and a solution container are required. No mixing, pumps, calibration equipment or accessories are required.

Sulfide ions can be detected using a variety of methods including electrochemistry, HPLC, ICP-AES, chemiluminescence (CL), etc. These methods are either time-consuming, labor-intensive, or unsuitable for rapid detection. Using Nextteq®'s colorimetric solution detector tubes is an efficient and cost-effective method for rapid and simple on-site detection of sulfide ions.

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Nextteq® colorimetric methods have received considerable attention since they show the advantages of rapidity and simplicity along with cost-effectiveness and no requirement of any sophisticated instruments. 

A great example is the use of Nextteq®'s sulfide ion solution detector tubes: 

Sulfide ions, a kind of widespread environmental contaminant, are frequently distributed in natural water and wastewater samples where they are either used as a reactant or are produced as a by-product of manufacturing or an industrial process. Sulfide ions easily generate H₂S gas that is responsible for the corrosion of many metals. Moreover, H₂S gas is hazardous for human health.