Heavy metals are metals that have a mass of more than 5 g / cm3 in the lower right corner of the periodic system. Heavy metals rarely form atoms themselves in water, but are usually bound by other compounds to form molecules. Heavy metal is a chemical compound that has the potential to cause environmental pollution problems. Methods of heavy metal content analysis in the aquatic environment developed simultaneously are still being developed. The simultaneous analysis provides an advantage in terms of time and cost efficiency. In this study is being developed heavy metal analysis based on the formation of complexes with oxin compounds. It is known that the oxide can form a yellow complex with several metal ions. The use of oxine as a complex is selected based on the color and pH of the complexes formed. By performing optimization and analysis of the complex system formed it is expected to produce an excellent method for the analysis of several heavy metals simultaneously using High Performance Liquid Chromatography (HPLC).

This study aims to describe the real motivation of students to join the program tahfidz at the Sakinah Quran House. This study used a qualitative method with a phenomenological approach. Data sources were taken from ten informants through an interview protocol. All interview results were then analyzed thematically using the NVivo 12 qualitative analysis software. Overall, the findings showed nine students' motivation to join the program. tahfidz.The nine motivations are: i) Reaching the blessing of Allah SWT through the Quran, ii) Wanting to be closer to the Quran, iii) being Interested in the beauty of the verses of the Quran, iv) Having the opportunity to help parents in the afterlife, v) Wanting to bring the memorization of the Quran before Allah SWT in the afterlife, vi) Want to pass on tahfidz beforehand, vii) There is encouragement from the family, viii) The environment, and ix) The course major that is occupied. The results of this study can be used as initial data for future researchers in examining different issues related to this problem and various other issues that are relevant to this context.

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