Determination of Level of Heavy Metals, Al-Quran Memorization and Intelligence Quotient (IQ) Among Tahfiz Students in Selangor

AHMAD ROHI GHAZALI, ISMARULYUSDA ISHAK, FARAH WAHIDA IBRAHIM, NOR MALIA ABD WARIF, MOHD JAMIL MOHD RAFAAI, ASMARIAH AHMAD, TAVA SHELAN NAGAPAN, ABDUSSALAM MOHAMAD, DZALANI HARUN, NORMAH CHE DIN

Abstract


Tahfiz school is an institution that specialises in educating students to memorize and recite the whole Al-Quran. Memorizing the Al-Quran by rote learning will activate the brain to improve the brain ability to process, store information and build memory. The presence of heavy metals affects the nervous system and interferes with the function of the central and peripheral nervous system which will then cause the impairment of mental and cognitive function. The ability to learn, remember or memorize, use of language and to understand something may be disrupted and cause small decrease in IQ and attention. Cross-sectional studies was conducted to measure and to determine the correlation between the levels of  heavy metals, Al-Quran memorization and intelligence (IQ) among students in selected tahfiz schools compared to non-tahfiz schools in Selangor. Levels of heavy metals in nail and hair samples were analyzed by using the Inductively Coupled Plasma Mass Spectrometry (ICP-MS). WASI-II test for intelligence was used to measure the student’s IQ. Questionnaires was used to obtain demographic data and was analyzed by using the SPSS version 23.0. Based on the Pearson correlation test, there was a very weak negative correlation and significant relationship between manganese in the hair samples with the level of Al-Quran memorization (r= -0.178, p=0.017). In addition, there was a weak positive correlation but significant relationship between the level of intelligence (IQ) with the level of Al-Quran memorization (r= 0.375, p=<0.001). As a conclusion, the higher the concentration of manganese will cause a decline in the level of Al-Quran memorization and the higher the level of Al-Quran memorization will cause an increase in the level of intelligence (IQ).


Keywords


Heavy metals; intelligence quotient (IQ); memorization; tahfiz; nail; hair

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