ELIMINASI GANGGUAN MATRIKS DALAM ANALISIS MERKURI HG SEBAGAI SENYAWA KOMPLEKS THIO MICHLER’S KETON SECARA SPEKTROFOTOMETRI

Abstract

Abstrak. Telah dilakukan penelitian tentang penyusunan metode analisis merkuri melalui pembentukan senyawa kompleks dengan 4,4'-Bis(dimethylamino)thio-benzophenone TMK. Senyawa kompleks tersebut berwarna biru kehijauan yang dapat dideteksi dengan spektrofoto-meter pada kondisi: max 574 nm; pH 3; konsentrasi TMK 0,0002 M, dan waktu tunggu selama 4-10 menit. perbandingan volume pereaksi: Hg(II), bufer pH 3, TMK 0,002 M, H2O bebas ion adalah 1:1:1:7. Dari hasil penelitian menunjukkan bahwa metode ini telah memenuhi validitas, yaitu: linieritas 0,05-2,0 mg/L, limit deteksi 0,008 mg/L, dan % recovery antara 98% -102%. Gangguan matriks akibat adanya ion-ion Au(III), Ag(I), Pd(II), Cu(II), Co(II), dan Fe(II) dapat dieliminasi dengan metode ekstraksi pelarut dan adisi standar. Metode adisi standar terbukti mampu memberikan data hasil pengukuran yang dapat dipercaya pada  5%, yaitu untuk sampel buatan sebesar (0,053  0,001) mg/L, air sungai (0,034  0,004) mg/L, dan sedimen sebesar (4,172  0,050) mg/kg. Dari hasil penelitian ini dapat disimpulkan bahwa metode ekstraksi pelarut dan adisi standar mampu mengeliminasi gangguan matriks pada analisis merkuri sebagai kompleks Hg-TMK secara spektrofotometri Kata kunci: Metode analisis merkuri, Thio Michler's keton, eliminasi, gangguan matriksAbstract. A research of analysis method for determination of mercury through formation of complex with 4,4'-bis(dimethylamino)thiobenzophenone TMK has been conducted. The green blue complex compound can be detected with spectrophoto-meter in conditions: max 574 nm, buffer acetate pH 3, concentration of TMK 0,0002 M, and the absorbance of complex remains stable for 4-10 minutes. The formula of reagents volume for: Hg(II): buffer acetate pH 3: TMK 0,002 M : de-ionized water is 1:1:1:7. This method is valid, with parameters such as linearity 0.05-2.00 mg/L, limit of detection 0.008 mg/L, and recovery in the range 98%-102%. Matrix interferences that are caused by Au(III), Ag(I), Pd(II), Cu(II), Co(II), and Fe(III) ions can be eliminated with solvent extraction and standard addition methods. Standard addition method is able to give data of trusty measurement result at  5%, that is for synthesis sample as (0.053  0.001) mg/L, river water (0.034  0.004) mg/L, and for sediment (4.172  0.050) mg/kg. From the result of this research, it can be concluded that solvent extraction and standard addition methods are able to eliminated matrix interferences in mercury analysis as Hg-TMK complex spectrophotometrically

Water striders (Gerris sp) and its potential as mercury bioindicators in Lake Taliwang, West Sumbawa, Indonesia

“…There will likely be greater content in the sediment [21]. It is also in line with Rochyatun's opinion, which revealed that heavy metals in sediment are higher than in water because it accumulates from precipitation and heavy metals in water are smaller due to the dilution process and the influence of current patterns [22][23][24].…”

Mercury contamination levels in rivers and resident wells in Padesa and Sepukur Villages, Lantung District, Sumbawa Regency, Indonesia

“…It is in line with the condition of the gold processing logs waste dump having a depth of 1 meter with an area of 2-3 m 2 . Heavy metal contamination usually accumulates at a depth of 75 cm above the ground [20][21]. So it can be concluded that the mercury level in the river is low even though the mercury level in the discharge is very high.…”