حيدر ياسين نور الجابري

Abstract Although testosterone (TST) has advantages in some situations, it can also be harmful to the environment and human health. This study uses cyclic voltammetry to examine the electrochemical properties of testosterone. Under ideal circumstances, the electrode's capacity to detect TST was assessed: temperature of 40 °C, an electrical scan rate of 50 mV.s", a pH of 12.679, and a temperature of 40 °C, while also considering potential interferences. The results revealed a linear calibration curve for testosterone within the concentration range of 3.467x105 - 3.467x10*M. The detection limit (LOD) was determined to be 4.137x10-SM, and the quantification limit (LOQ) was 1.235×10*M. Thermodynamic parameters were also calculated, with the enthalpy (4H) found to be 2.586 kJ-mol'' and the entropy (4S) - 262.22 J •K-'mol'' and (4G) 105.025 kJ-mol"'. At 0.019 cm?, the electrode surface area was measured. High precision was shown by the bulk and from relative standard deviations (RSD%) being less than 2%. The voltammogram indicated an irreversible, diffusion-controlled process. The practical value of this approach was demonstrated by its successful quantification of testosterone in bulk and pharmaceutical formulations.

abstract:%0AThis%20study%20uses%20a%20glassy%20carbon%20electrode%20(GCE)%20and%20the%20square-wave%20voltammetric%20(SWV)%20method%20to%20measure%20testosterone.%20Testosterone%20(TST)%20was%20found%20in%20pharmaceutical%20formulations%20using%20the%20SWV%20approach,%20which%20is%20renowned%20for%20its%20great%20sensitivity%20and%20selectivity.%20Over%20a%20concentration%20range%20of(3.467%20%C3%97%2010-5%20-%203.467%20%C3%97%20104)%20form%20M,%20the%20approach%20demonstrated%20a%20linear%20response%20with%20(%20LOD)%20of%206.22%C3%9710-?%20M%20and%20(LOQ)%20of%201.884%C3%9710-6%20M.%20It%20also%20had%20remarkable%20repeatability%20(RSD%20%3C%205%25).%20Selective%20detection%20was%20achieved%20through%20careful%20pH%20adjustment%20and%20electrode%20modification,%20mitigating%20matrix%20interferences.%20Validation%20via%20recovery%20studies%20in%0Acommercial%20samples%20yielded%2097-101%25%20accuracy,%20underscoring%20the%20method's%20reliability.%20According%20to%20the%20scan%20rate%20analysis,%20the%20process%20is%20totally%20irreversible%20in%20the(0.02-0.5)%20V/s%20range,%20and%20diffusion%20and%20adsorption%20control%20the%20oxidation%20of%20TST%20on%20the%20GCE%20surface.%20(TST)%20showed%20an%20irreversible%20oxidation%20peak%20of%20around%20+1.490%20V%20GCE.%20The%20method's%20effective%20application%20in%20the%20analysis%20of%20testosterone%20in%20pure%20form%20and%20pharmaceutical%20formulations%20further%20confirms%20its%20applicability%20and%20confirms%20its%20potential%20for%20use%20in%20clinical%20monitoring,%20pharmacokinetic%20investigations,%20and%20quality%20control.

Freshwater provides significant ecosystem services, but natural and anthropogenic activities can negatively affect these services by affecting water quality properties (WQPs). The present study focuses on a section of the Euphrates River in Al-Najaf, Iraq, over a 10-month period (December 2018–September 2019) to evaluate whether the water quality complies with the standards for recreational and drinking water safety under local hydrological conditions. A waterproof multimeter and atomic absorption spectroscopy were used to measure some of the main physicochemical variables (total dissolved solids (TDS), electrical conductivity, salinity, sulfate, phosphate, nitrate, and heavy metals), with Gram-negative bacteria counted. Gram-negative bacteria and sulfates exceeding World Health Organization (WHO) guideline limits suggest potential fecal contamination and treatment failure, increasing the risk of waterborne infections. Furthermore, heavy metal concentrations were up to twice the WHO limits on specific sampling dates. WQPs varied significantly over time (p < 0.05), following a seasonal trend and becoming unhealthy as they deviated from WHO guidelines, as follows: winter > spring > summer. An increase in TDS, sulfate, and heavy metal concentrations in winter may reflect a potential increase in wastewater discharge. The results highlight the impact of local climate and the effects of upstream dams on water quality.

قياس العينات في جهاز الاشعه فوق البنفسجيه spectrophotometer يتم الان استقبال الطلبه والباحثين الراغبين في قياس عينات في جهاز ال UV-VIS

المباشره قي قياس عينات الطلبه والباحثين الراغبين في قياس العينات على جهاز الامتصاص الذري Atomic Absorption

مسؤول عن وحدة التشخيص في جهاز الاشعه تحت الحمراء IR وقياس عينات للطلبه والباحثين في المختبر المركزي في كلية الصيدله