GB/T 35492-2017Determination of organotin content of latex products - GC-MS method (English PDF)

4.1 Acetone

Analytical pure.

4.2 n-Hexane

Analytical pure.

4.3 Tetraethyl sodium boride

Content of more than 98%.

4.4

organotin standard purity >= 98%, see Appendix A.

4.5

Organic Filter, 0.22 µm, NYLON.

4.6

Acetic acid buffer solution .1mol/L sodium acetate solution, adjusted to pH = 4.0 with glacial acetic acid.

4.7

Anhydrous sodium sulfate Take appropriate amount of anhydrous sodium sulfate (Na2SO4), at 650 °C for 4h, cooled and stored in a desiccator for use.

4.8

Tetraethyl sodium borohydride solution, mass fraction 2%, prepared in brown volumetric flask with deionized water, placed in a 4 °C refrigerator protected from light.

4.9

Organotin standard stock solution The standard stock solution concentration is based on the organotin cation concentration. Accurately weigh the right amount of organotin standard

After dissolving with a small amount of acetone, dilute to volume in a brown volumetric flask with a mass concentration of 1000 mg/L. Refer to Appendix B for the preparation method. Standard

Quasi-stock solution should be placed in a refrigerator at 4 °C protected from light, the use of valid for 6 months.

4.10 organic tin standard working solution

According to the actual sample testing needs, diluted with acetone to a suitable concentration of the mixed standard working solution, the line

Sex range 1mg/L ~ 100mg/L. Standard working solution should be placed in the refrigerator at 4 °C dark, the use of valid for 1 month.