RESUMO
With the growing development of modern agriculture and industry, groundwater is facing more and more complex contaminants. One such contaminant is per- and polyfluoroalkyl substances (PFASs), which pose a potential risk to human health, particularly for those who rely on groundwater as their primary source of drinking water. In this study, we conducted a comprehensive investigation on the occurrence, spatial distribution, and source apportionment of PFASs in shallow (<60 m) and deep (>80 m) groundwater samples from a reclaimed water irrigation area in Beijing's suburbs. Our results showed that the average total PFAS concentration (∑10PFAS) for all samples was 10.55 ± 7.77 ng/L, ranging from 1.05 to 34.28 ng/L. The dominant congeners were PFBA, PFOA, and PFBS. No significant linear relationship was observed between PFAS concentrations and the well depth. However, the averaged ΣPFASs in groundwater were highest in the uppermost layer and declined sharply to a few ng/L in the deep aquifer below 80 m. PFASs showed elevated concentration in shallow aquifers in 9 out of 11 paired wells, indicating an overall descending trend of PFASs with increasing aquifer depth. The spatial distribution of PFASs was highly heterogeneous and showed different patterns in shallow and deep groundwater, which may be related to the complicated attenuation behavior of PFAS compounds when they transport and diffuse through overlapping aquifer layers. The influence of the landfill on groundwater PFASs was most pronounced within a 5 km radius. Source apportionment results indicated that reclaimed water irrigation is the main non-point source of PFASs in shallow groundwater. In contrast, deep groundwater is primarily subject to point sources and lateral recharge flow. This investigation of PFASs in shallow and deep wells provides a foundation for further exploration of PFASs transportation and risk prevention in regions where groundwater is a major water resource for domestic and industrial development.
RESUMO
Objective To observe the application effect of point massage combined with physiotherapy in the treatment of insomnia for community elderly.Methods 30 elderly patients with insomnia who accepted point massage combined with physiotherapy were selected as observation group,and 30 elderly patients treated in tertiary hospital with insomnia who took alprazolamum for treatment were selected as control group.The SRSS score of the two groups before and after treatment,as well as treatment efficacy were compared.Results The insomnia treatment efficacy of the observation group was higher than that of the control group(Z =2.45,P <0.05).The SRSS rating of the observation group before treatment was (30.76 ±7.1 9)points and after treatment was (1 5.43 ±3.95)points.The SRSS rating of the control group before treatment was (32.33 ±6.98)points,which after treatment was (21 .93 ±6.73)points.The SRSS scores of both two groups after treatment were decreased (t =1 0.23,5.87,all P <0.05),with obvious differ-ences.The SRSS scores of the observation group decreased more obviously and was lower than that of the control group (t =4.56,P <0.05).Conclusion The point massage combined with physiotherapy can effectively improve insomnia of the elderly,which is also with advantages of easy operation and no obvious side effects and high cooperation degree etc,and it is suitable to be promoted in community.
