GDX, XAD series sampling tubes and enrichment columns

GDX-102/TDX-01 combination sampling tube

Using outer diameter8mm, wall thickness0.8～1mm, Long70mmStainless steel pipe with segmented filling inside40～60eyeGDX-102reachTDX-01.

XAD-7 sampling tube

Sampling tube: inner diameter6mm， Outer diameter 8mm, length 11cm.

Preparation method:

According to the diagramAs shown in Figure 1.4, fill a small amount of glass wool at the A end of the sampling tube, then add 100mg of XAD-7 adsorbent, and sequentially fill in a small amount of glass wool, 75mg of XAD-7 adsorbent, and a small amount of glass wool. Finally, place the glass fiber filter membrane from end A, compact it with a glass rod, fix it with V-shaped steel wire, and seal both ends with polytetrafluoroethylene caps.

GDX-502 enrichment column

Outer diameter and characteristics of adsorption tube:

Hard glass variable diameter straight pipe. Coarse end（The A end is 80mm long and has an inner diameter of 6mm; the thin end (B end) is 20mm long and has an inner diameter of 3mm; the wall thickness is 0.8mm. After soaking in detergent for 2 hours, rinse with tap water and distilled water in sequence, and dry.

Preparation of adsorption tube:

WeighingAdd 0.2g of adsorbent into the adsorption glass tube, fix both ends with glass wool, and seal the tube mouth with a rubber cap lined with fluoroplastic film. Refer to Figure 1.5.

Oxalic acid glass microsphere sampling tube

Oxalic acid glass bead sampling tube is suitable for the determination of trimethylamine in gas state in the exhaust of odor pollution sources and the ambient air of factories. Glass microspheres coated with oxalic acid are used as adsorbents and loaded into the sampling tube. Inject saturated sodium hydroxide solution and nitrogen into the sampling tube to free the collected trimethylamine into a gaseous state and enter the vacuum treated sampleIn a 100mL desorption bottle, take 1 gas from the bottle～2mLInject directly into the gas chromatograph and perform quantitative analysis on trimethylamine based on its chromatographic peak area (or peak height), as shown in the figure1.6.

Preparation method:

support60～80Purpose: After cleaning and drying the glass microsphere carrier with concentrated hydrochloric acid and distilled water, the surface of the glass microsphere is coated with distilled water as the solvent1%Oxalic acid and0.15%Glycerol. In a vacuum drying oven（80℃) Vacuum drying2～3hAfterwards, seal in a brown bottle for later use. The storage period is one month.

Before sampling, align the sampling tube according to the diagram1.6Fill glass wool, oxalic acid glass microspheres, glass wool in sequence, and seal both ends with plastic caps and silicone rubber plugs. Fill the sampling tube before use.

Reference national standard:

GBT/14676-1993Air quality - Determination of trimethylamine - Gas chromatography method

Thiol cotton sampling tube

Thiol cotton sampling tubes are suitable for the determination of mercury and its compounds in ambient air and water. Refer to the diagram for specific specifications1.7.

Weighing0.1gThiol cotton is inserted into the quartz sampling tube from the large-diameter end and pressed into the inner diameter6mmIn the pipe section, the length of thiol cotton is approximately3cmBefore use0.40mL PH=3Hydrochloric acid solution (suction)2.0mol/LHydrochloric acid（4.9）0.50mLDilute with water to1000mLMix well. ）Acidified thiol cotton. The ends of the thiol cotton sampling tube should be sealed with sleeves and stored in a mercury free container.

Reference standards

HJ 542-2009Determination of Mercury in Environmental Air - Thiol Cotton Enrichment-Cold atomic fluorescence spectrophotometry

Thiol cotton sampling tube: quartz, see figure1.7.

Weighing0.1gThiol cotton is inserted into the quartz sampling tube from the large-diameter end and pressed into the inner diameter6mmIn the pipe section, the length of thiol cotton is approximately3cmBefore use0.40mL PH=3Hydrochloric acid solution（4.10）Acidified thiol cotton. The ends of the thiol cotton sampling tube should be sealed with sleeves and stored in a mercury free container.

HJ 597-2011replaceGB 7468-87 2011-06-01Determination of total mercury in water quality - Cold atomic absorption spectrophotometric method

Thiol cotton fiber tube mercury removal method: within the inner diameter6～8mmLong term agreement100mmA glass tube that is stretched thin on one end, or500mLPlace the separating funnel into the liquid tube and fill it0.1～0.2gMercapto cotton fiber（5.10）Use the reagent to be purified10mL/minThe mercury can be completely removed by passing through it at a speed of one to two times.

GB/T 17132-1997Determination of Methylmercury in the Environment by Gas Chromatography

Thiol cotton tube: long80mm, inner diameter4mmA glass tube with a flat top and slightly tapered bottom, as shown in the figure1.8Interior Decoration0.04～0.05g.

GB/T 14204-93Water quality - Determination of alkylmercury - Gas chromatography method

Thiol cotton tube: inside diameter5～8mm, Long100mmFill the glass tube that has been stretched thin at one end0.1～0.2g（S.C.F）,See figure1.9Before use20mLMercury free distilled water（2.2.14）Wet and expand, then connect to the drain tube of the separating funnel.