ﺣﺬف ﻣﻮﺛﺮﯾﻮنﻫﺎي ﺟﯿﻮه )II( از ﻧﻤﻮﻧﻪﻫﺎي آﺑﯽ زﯾﺴﺖ ﻣﺤﯿﻄﯽ ﺑﺎ اﺳﺘﻔﺎده از ﻧﺎﻧﻮﺗﯿﻮبﻫﺎيﮐﺮﺑﻨﯽﮐﺮﺑﻮﮐﺴﯿﻠﻪ ﺑﻮﺳﯿﻠﻪ روش اﺳﺘﺨﺮاج ﻓﺎز-ﺟﺎﻣﺪ ﭘﺨﺸﯽ

Effective removal of mercury (II) from environmental aqueous samples using carbon nanotubes carboxylated by dispersive solid-phase extraction method

وﺟﻮد ﻣﻘﺎدﯾﺮ اﻧﺪك ﻓﻠﺰات ﺳﻨﮕﯿﻦ در آﺑﻬﺎي زﯾﺮزﻣﯿﻨﯽ و ﺳﻄﺤﯽ در ﻣﺤﯿﻂ زﯾﺴﺖ ﻣﻮﺟﺐ ﻧﮕﺮاﻧﯽﻫﺎي ﻗﺎﺑﻞ ﺗﻮﺟﻬﯽ ﺑﺮاي ﺳﻼﻣﺘﯽ اﻧﺴﺎن و آﺑﺰﯾﺎن ﺷﺪه اﺳﺖ. ﻣﻘﺪار ﺑﺴﯿﺎر ﮐﻤﯽ از ﻓﻠﺰات ﺳﻨﮕﯿﻦ ﻣﺎﻧﻨﺪ ﺟﯿﻮه )II( ﻣﯽﺗﻮاﻧﺪ رﺷﺪ ﻣﻐﺰ را ﻣﺨﺘﻞ ﮐﺮده و ﻧﺎﺗﻮاﻧﯽﻫﺎي ﺷﻨﺎﺧﺘﯽ و ﺣﺮﮐﺘﯽ اﯾﺠﺎد ﮐﻨﺪ. ﻫﺪف از اﯾﻦ ﻣﻄﺎﻟﻌﻪ، اﺳﺘﻔﺎده از ﯾﮏ روش ﺳﺎده و ﺳﺮﯾﻊ ﺑﻪ ﻣﻨﻈﻮر ﺣﺬف و اﻧﺪازهﮔﯿﺮي ﻣﻘﺎدﯾﺮ ﻧﺎﭼﯿﺰ از ﯾﻮن ﺟﯿﻮه )II( در ﻧﻤﻮﻧﻪﻫﺎي آﺑﯽ ﺑﻮده اﺳﺖ. در روش ﺣﺎﺿﺮ، از ﻧﺎﻧﻮﻟﻮﻟﻪﻫﺎي ﻓﻌﺎل ﺷﺪه ﺑﺎ ﮐﺮﺑﻮﮐﺴﯿﻞ ﺑﺮاي ﺑﻬﺒﻮد ﻋﻤﻞ ﺣﺬف و ﭘﯿﺶﺗﻐﻠﯿﺾ ﺟﯿﻮه )II( اﺳﺘﻔﺎده ﺷﺪه اﺳﺖ. ﻣﺘﻐﯿﺮﻫﺎﯾﯽ ﻧﻈﯿﺮpH اﺳﺘﺨﺮاج، ﻣﻘﺪار و ﻧﻮع ﺣﻼل ﻣﺎده ﺷﻮﯾﺸﯽ، زﻣﺎن اﺳﺘﺨﺮاج، اﺛﺮ ﯾﻮﻧﻬﺎ و ﻏﯿﺮه ﺑﺮاي ﭘﯿﺶﺗﻐﻠﯿﺾ ﺟﯿﻮه )II( ﺗﻮﺳﻂ ﺟﺎذب ﺑﻬﯿﻨﻪﺳﺎزي ﺷﺪهاﻧﺪ. اﻧﺪازهﮔﯿﺮي ﺟﺬب ﺑﺮاي ﺑﺮآورد ﺟﯿﻮه )II( ﺑﺎ اﺳﺘﻔﺎده از دﺳﺘﮕﺎه ﺟﺬب اﺗﻤﯽ ﺷﻌﻠﻪ اﻧﺠﺎم ﺷﺪ. ﻧﺘﺎﯾﺞ ﺑﯿﺎﻧﮕﺮ ﮐﺎراﯾﯽ ﻣﻨﺎﺳﺐ اﯾﻦ روش در ﺟﺬب ﯾﻮنﻫﺎي ﺟﯿﻮه )II( ﺑﻮده اﺳﺖ. ﻣﺘﻐﯿﺮﻫﺎي ﻏﻠﻈﺘﯽ، ﺣﺪﺗﺸﺨﯿﺺ )LOD( ﺑﺮاي اﯾﻦ روش و آزﻣﻮن اﻧﺤﺮاف اﺳﺘﺎﻧﺪارد ﻧﺴﺒﯽ )RSD٪( ﺑﻪ ﺗﺮﺗﯿﺐ20/83، 6ﻣﯿﮑﺮوﮔﺮم ﺑﺮ ﻟﯿﺘﺮ و 1/16درﺻﺪ ﺑﺪﺳﺖ آﻣﺪه اﺳﺖ. روش اﺳﺘﺨﺮاج ﻓﺎز-ﺟﺎﻣﺪ ﭘﺨﺸﯽ ﺑﺎ ﺑﮑﺎرﮔﯿﺮي ﺟﺎذب ﻧﺎﻧﻮﺗﯿﻮبﻫﺎيﮐﺮﺑﻨﯽﮐﺮﺑﻮﮐﺴﯿﻠﻪ ﻧﺸﺎن دﻫﻨﺪهي ﺗﮑﺮارﭘﺬﯾﺮي، رﻧﺞ ﺧﻄﯽ و ﻓﺎﮐﺘﻮرﺗﻐﻠﯿﻆ ﻣﻨﺎﺳﺐ ﺟﻬﺖ ﺗﻌﯿﯿﻦ ﺟﯿﻮه )II( ﻣﯽﺑﺎﺷﺪ و روﺷﯽ ﮐﺎراﻣﺪ ﺑﺮاي ﺣﺬف ﯾﻮن ﺟﯿﻮه )II( از ﻧﻤﻮﻧﻪﻫﺎي آﺑﯽ زﯾﺴﺖ ﻣﺤﯿﻄﯽ ﻣﻌﺮﻓﯽ ﻣﯽﺷﻮد.

A very small amount of heavy metals such as mercury (II) can disrupt brain expansion and motor disabilities and generates cognitive. This study aimed to use a simple and rapid method to remove and measure small amounts of mercury (II) ions in aqueous samples. In the present method, carbon nanotubes carboxylated have been used to improve the removal and preconcentration of mercury (II). Parameters such as extraction pH, amount and type of eluent solvent, extraction time, ion effect, etc. have been optimized for the pre-concentration of mercury (II) by the adsorbent. Absorption measurements were performed to estimate mercury (II) using a flame atomic absorption spectrometer. The results showed the proper efficiency of this method in the adsorption of mercury (II) ions.The parameter of concentration, level of detection (LOD) of this procedure, and relative standard deviation test (RSD %) achieved as 20.83, 6 µg L-1, and 1.16%, respectively. The dispersive solid-phase extraction method using carbon nanotubes carboxylated adsorbent indicates suitable of the reproducibility, level of detection (LOD), and concentration factor for the determination of mercury (II), also this method was introduced as an efficient method for the removal of mercury (II) ions from environmental aqueous samples.