A highly selective and sensitive adsorptive stripping procedure for simultaneous determination of trace tin and zinc is presented in this study. The method is based on the adsorptive accumulation of the complexes of Sn (II) and Zn (II) ions with 2, 2hydroxyphenylbenzoxazole (HBO) onto a hanging mercury drop electrode, followed by the reduction of the adsorbed species by differential pulse cathodic stripping voltammetry. The optimal experimental conditions include the use of 0.1 M acetate buffer (pH 5.0), 2.0×10-5 M HBO, an accumulation potential of-0.35 V (versus Ag/AgCl), an accumulation time of 90 s and a scan rate of 100 mV/s. Under optimized conditions, linear calibration curves were established for the concentration of Sn(II) and Zn(II) in the range of 0.2-100.0 µg/L and 0.1-120.0 µg/L, respectively, while the detection limit is 0.09 µg/L for tin and 0.01µg/L for zinc for a 90 s adsorption time. The method was applied to the determination of tin and zinc in biological samples with satisfactory results.
Background: Preterm labor is defined as labor before 37 weeks of gestation, which is associated with neonatal mortality. Due to contradictory results of studies conducted on the relationship between preterm labor and dental decays and lack of research in this regard in Iran, the present study was conducted with the aim of evaluating the relationship between DMFT (decayed, missing, and filled teeth) index and preterm labor in pregnant women in Hamadan. Methods: This study is a case-control study. The total number of samples was 227 pregnant women studied in two groups, 114 women in case and 113 women in the control group. The data collection method was interview and examination and the data collection tool was a questionnaire consisting of three sections, including demographic, midwifery, and dental information. The data were analyzed through SPSS software version 16.0 using descriptive and analytical statistics, independent t test and chi-square and at the significance level of P<0.05. Results: The mean age of the subjects was 28.41 ± 6.26 years. The mean score of the DMFT index was 13.02 ± 6.20 in the case group and 10.70 ± 6.12 in the control group, indicating a statistically significant difference between the two groups (P = 0.005). The results showed that there was no significant relationship between DMFT index and preterm labor (P = 0.779). Conclusions: Based on the results of the study, the DMFT index is high in women with preterm labor, so providing necessary education before and during pregnancy by health service providers and mass media for pregnant women is essential to maintain and promote oral hygiene and reduce the complications of pregnancy.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.