@article{sui_feng_ankeny_vinueza_2022, title={Quantification of docusate antimicrobial finishing after simulated landfill degradation via tandem mass spectrometry and QuEChERS extraction}, volume={10}, ISSN={["1759-9679"]}, url={https://doi.org/10.1039/D2AY01153K}, DOI={10.1039/d2ay01153k}, abstractNote={Quantification of silver docusate antimicrobial finishing in soil by tandem mass spectrometry after QuEChERS extraction.}, journal={ANALYTICAL METHODS}, author={Sui, Xinyi and Feng, Chengcheng and Ankeny, Mary and Vinueza, Nelson R.}, year={2022}, month={Oct} }
 @article{feng_sui_ankeny_vinueza_2021, title={Identification and quantification of CI Reactive Blue 19 dye degradation product in soil}, volume={137}, ISSN={["1478-4408"]}, url={https://doi.org/10.1111/cote.12527}, DOI={10.1111/cote.12527}, abstractNote={AbstractLandfills are becoming the most common way to dispose textiles. The presence of different types of dyes and finishes on textiles fabrics can become an important source of pollution during the degradation process, due to the fact that these chemicals can leach to the soil. The biodegradation of dyes from dyed fabrics is not fully understood, and what can leach into the soil can be more toxic. In this study, cotton fabrics were dyed with CI Reactive Blue 19 (RB19) and biodegraded in soil in a laboratory‐controlled environment for a 90‐day time interval by using the ASTM D 5988‐18 method. A modified QuEChERS (quick, easy, cheap, effective, rugged, and safe) extraction method, in combination with liquid chromatography‐mass spectrometry (LC‐MS) analysis, was applied to soil containing RB19 after the degradation process. An unknown degradation product, with a mass‐to‐charge ratio (m/z) of 393, found in the soil was characterised and confirmed, via high‐resolution MS and tandem MS, to be CI Acid Blue 25 (AB25). To quantify the confirmed unknown product extracted from the degraded soil sample, a quantitation method was developed using high‐performance liquid chromatography‐diode array detector‐mass spectrometry (HPLC‐DAD‐MS). The quantitation method provided excellent linearity (R2 = 0.9990 ± 0.0006), accuracy (mean percentage error = 5.17 ± 1.88), precision (mean percentage coefficient of variation = 4.73 ± 4.16), and sensitivity (lower limit of quantitation = 1.29 ± 0.47 µg/mL) for nine concentrations ranging from 0.5 to 40 µg/mL.}, number={3}, journal={COLORATION TECHNOLOGY}, publisher={Wiley}, author={Feng, Chengcheng and Sui, Xinyi and Ankeny, Mary Ann and Vinueza, Nelson R.}, year={2021}, month={Jun}, pages={251–258} }
 @article{feng_michielsen_attinger_2018, title={Impact of carpet construction on fluid penetration: The case of blood}, volume={284}, ISSN={["1872-6283"]}, DOI={10.1016/j.forsciint.2018.01.009}, abstractNote={Bloodstains and bloodstain patterns are often observed at crime scenes and their analysis through bloodstain pattern analysis (BPA) can assist in reconstructing crime scenes. However, most published work related to BPA only deals with hard, non-porous surfaces and none of the studies have carefully characterized carpets. Soft and porous carpets are often encountered at crime scenes since they are common in American homes accounting for 51% of total U.S. flooring market; this has motivated the research described herein. To assess fluid penetration into tufted carpers, a new method for determining porosity and pore size distribution in tufted carpets has been developed for bloodstains on carpet. In this study, three kinds of nylon carpet were used: a low, a medium and a high face-weight carpet. Each carpet had an antistain treatment, which was removed from half of each carpet by steam-cleaning with a pH 12 NaOH solution. This resulted in six carpet samples. Yarn twist, carpet weight, pile height, water contact angles on carpets, water contact angles on individual fibers, and fiber cross-sectional shapes were characterized. Porosity and pore size distribution were analyzed using confocal laser scanning microscopy (CLSM). Porcine blood was used as a human blood substitute at three liquid volumes (30μL, 10μL, and 2μL). Analysis showed that porous carpet construction and antistain finishing both affected penetration. The depth of blood penetration decreased with the increase of carpet face-weight but increased with increased drop height. The removal of antistain treatment increased blood penetration into the carpets and changed the pore size distribution. Effects of antistain treatment, porosity and pore size distribution of tufted carpet, and blood wicking behaviors on carpets were found to strongly affect blood penetration into the carpets.}, journal={FORENSIC SCIENCE INTERNATIONAL}, author={Feng, Chengcheng and Michielsen, Stephen and Attinger, Daniel}, year={2018}, month={Mar}, pages={184–193} }