Mercury in Waters of the Derwent Estuary—Sample treatment and analysis

Plaschke, Ron; Pont, G. Dal; Butler, Edward C. V.

doi:10.1016/s0025-326x(96)00085-9

Cited by 12 publications

(7 citation statements)

References 26 publications

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“…Kestabilan asam yang digunakan dan partikulat merkuri memiliki korelasi yang kuat dimana kedua komponen tersebut merupakan kontributor utama di matriks air 112 Gambar 1. Mercury Analyzer RA-4500 Keterangan : Pengukuran diulang setiap 1(satu) minggu sekali selama 1(satu) bulan (Plaschke, Dal Pont, & Butler, 1997). Obyek percobaan ini adalah 2 (dua) larutan standar merkuri dengan konsentrasi yang berbeda yaitu 1000 μg/L dan 4 μg/L, terhadap larutan standar tersebut masing-masing ditambahkan larutan pengawet yaitu L-Cysteine+HNO 3 0,2%, larutan K 2 Cr 2 O 7 0,05%+HNO 3 5%, dan larutan BrCl 0,5%.…”

Section: Hasil Dan Pembahasanunclassified

Uji Kestabilan Kadar Merkuri pada Beberapa Larutan Pengawet

Tapriziah

Nazir²,

Suryatama³

2022

ecolab

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merupakan satu dari lima unsur yang mudah menguap dan berbentuk cair pada temperatur kamar. Konsentrasi merkuri di lingkungan pada umumnya cukup rendah terutama di dalam air, sehingga diperlukan suatu perlakuan pengawetan pada saat pengambilan sampel untuk menjaga kestabilan konsentrasi merkuri. Tujuan uji stabilitas ini adalah untuk mengetahui pengawet mana yang paling baik dalam menjaga kestabilan konsentrasi merkuri terutama pada konsentrasi rendah antara larutan Kalium dikromat (K 2 Cr 2 O 7 ), larutan L-Cystiene dan larutan Bromin klorida (BrCl). Kegiatan ini dilakukan di Laboratorium Merkuri Pusat Standardisasi Instrumen Kualitas Lingkungan Hidup (PSIKLH) pada tanggal 4 Juli sampai dengan 25 Juli 2022. Dalam kajian ini dilakukan pemantauan kestabilan larutan standar Hg 1000 μg/L dan 4 μg/L selama 4 (empat) pekan. Larutan standar tersebut ditambahkan dengan 3 (tiga) larutan pengawet pada masing-masing labu ukur yaitu larutan L-Cysteine+ HNO 3 0,2%, larutan K 2 Cr 2 O 0,05%+ HNO 3 5%, dan larutan BrCl 0,5%. Setiap larutan standar kemudian diukur menggunakan alat mercury analyzer dengan metode Cold Vapour Atomic Absorption Spektrofotometer (CVAAS). Konsentrasi larutan standar Hg 1000 μg/L di ketiga larutan pengawet setelah percobaan selama 4 minggu masih memenuhi batas keberterimaan yaitu memiliki nilai %RSD di bawah batas upper warning limit (UWL) yang dipersyaratkan dalam bagan kendali (control chart) laboratorium, sedangkan kondisi larutan standar Hg dengan konsentrasi 4 μg/L yang ditambahkan larutan pengawet L-Cysteine+HNO 3 0,2% memiliki %RSD yang tidak memenuhi batas keberterimaan laboratorium. %RSD terkecil diperoleh oleh larutan standar Hg yang ditambahkan pengawet BrCl 0,5%.

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Section: Hasil Dan Pembahasanunclassified

Uji Kestabilan Kadar Merkuri pada Beberapa Larutan Pengawet

Tapriziah

Nazir²,

Suryatama³

2022

ecolab

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“…Gehrke et al 1995). Much of the little Hg research that has been conducted in Australia has focussed on marine sites in heavily industrialised areas such as Port Philip Bay in Victoria (Phillips et al 1992), the southern coast of New South Wales (Gibbs and Miskiewicz 1995) and the Derwent Estuary in Tasmania (Plaschke et al 1997). These case studies were likely initiated in response to public concern surrounding the discharge of waste containing Hg and other metals to receiving waters, and will be discussed in more detail below.…”

Section: We Have Not Looked Hard Enoughmentioning

confidence: 99%

“…In southern Australia, areas with other known point-source discharges to rivers and estuaries have also shown elevated concentrations of Hg in fish. In the Derwent Estuary, Tasmania, the operation of a zinc refinery and paper mill resulted in direct Hg discharges to the receiving environment and waterborne concentrations as high as 16 µg L -1 in the 1970s (Plaschke et al 1997). Although concentrations in fish were high at the time (1 µg g -1 in sand flathead Platycephalus bassenis in 1974; Dix et al 1975), they have since declined (0.5 µg g -1 in sand flathead in 1983; Langlois et al 1987), and much of the current Hg is bound to suspended solids (Plaschke et al 1997), possibly rendering it unavailable for uptake to the food web.…”

Section: There Are Few Point Sources Of Hg To the Aquatic Environmentmentioning

confidence: 99%

Northern Australia, whither the mercury?

Jardine

Bunn

2010

Mar. Freshwater Res.

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Biomagnification of mercury (Hg) leads to high concentrations in fish and subsequent health risks for fish-eaters. Despite the global concern afforded to Hg over the past 40 years, little attention has been paid to this toxic heavy metal in Australia in general, and tropical northern Australia in particular. This review examines past Hg research in Australia and explores seven hypotheses as to why so little research and monitoring has been conducted in northern rivers and estuaries. We rule out the possibility that fishing intensity (an indicator of potential Hg exposure in humans) is lower in Australia than in other countries with more intensive Hg research programs. Instead, we hypothesise that low atmospheric deposition, owing to prevailing wind direction and few local point sources, coupled with highly productive waterbodies, contributes to low Hg bioaccumulation and hence the reduced interest in measuring Hg. Outstanding questions regarding Hg in northern Australia include the assessment of atmospheric deposition rates of Hg, the trophic level and growth and food consumption rates of consumers such as large-bodied fishes, linkages between fire regimes and Hg availability, and the capacity for in situ Hg methylation in tropical systems.

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“…The sampling was performed in September 1997 and in April 1999, during neap tides with a tidal range of 1.5 m. A calibrated sensor was used to measure salinity in situ. Surface and bottom waters were collected with an acid-washed 5 dm 3 PVC ''Niskin'' bottle, a type that has been found to be suitable for collecting water samples for mercury analysis (Plaschke et al, 1997). Samples for DOC analysis were only collected in the April survey.…”

Section: Sample Collection and Pre-treatmentmentioning

confidence: 99%

Mercury distribution in Douro estuary (Portugal)

Ramalhosa

Pereira

Vale

et al. 2005

Marine Pollution Bulletin

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Determinations of dissolved reactive and total dissolved mercury, particulate and sedimentary mercury, dissolved organic carbon (DOC), particulate organic carbon (POC) and suspended particulate matter (SPM) have been made in the estuary of river Douro, in northern Portugal. The estuary was stratified by salinity along most of its length, it had low concentrations of SPM, typically <20 mg dm À3 , and concentrations of DOC in the range <1.0-1.8 mg dm À3 . The surface waters had a maximum dissolved concentration of reactive mercury of about 10 ng dm À3 , whereas for the more saline bottom waters it was about 65 ng dm À3 . The surface waters had maximum concentrations of total suspended particulate mercury of $7 lg g À1 and the bottom waters were always <1 lg g À1 . Concentrations of mercury in sediments was low and in the range from 0.06 to 0.18 lg g À1 . The transport of mercury in surface waters was mainly associated with organic-rich particulate matter, while in bottom waters the dissolved phase transport of mercury is more important. Lower particulate organic matter, formation of chlorocomplexes in more saline waters and eventually the presence of colloids appear to explain the difference of mercury partitioning in Douro estuarine waters.

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Mercury in Waters of the Derwent Estuary—Sample treatment and analysis

Cited by 12 publications

References 26 publications

Uji Kestabilan Kadar Merkuri pada Beberapa Larutan Pengawet

Uji Kestabilan Kadar Merkuri pada Beberapa Larutan Pengawet

Northern Australia, whither the mercury?

Mercury distribution in Douro estuary (Portugal)

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