European Directory of Marine Environmental Data (EDMED)

Data set information

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General
Data set name

CTDO, Cd and Hg data in coastal zone of Ligurian Sea (1978)

Data holding centreENEA Centro Ricerche Ambiente Marino - La Spezia
CountryItaly  Italy
Time periodApril 1978
OngoingNo
Geographical area

The Ligurian Sea extending from Punta Mesco to Marina di Massa and including the Gulf of La Spezia

Observations 
Parameters

Salinity of the water column

Instruments

Fluorometers; discrete water samplers; spectrophotometers

Description 
Summary

At each station, samples were collected at the surface, about 2-3 m from the bottom and at a depth midway between the two using N.I.O. bottles. Dissolved oxygen, conductivity and temperature were measured in situ with a CTD Neil Brown mod. MARK III. The samples utilized for the analysis of inorganic mercury were conserved in glass bottles and acidified with HCl (Carlo Erba, RS) until a pH of 1 was obtained. Those utilized for the determination of cadmium were stored in stable polythene bottles. The surface and the bottom samples were analyzed for cadmium while the sample taken halfway between the two was used for the analysis of mercury. Inorganic mercury was determined using atomic fluorescence spectrometry following the separation of Hg with stannous chloride, the concentration of its vapours on gold granules and the heating of the amalgam in a current of argon. The method showed a standard deviation of 4.5 per cent at a concentration of 20 ng/l of Hg. Cadmium was determined using flameless atomic absorbance spectrometry after electrolytic deposition of Cd at a constant potential after bubbling nitrogen through the sample. A potential of -1.5V with respect to the reference electrode of saturated calomel was used as the reference. The method showed a standard deviation of about 10 per cent at a level of concentration of some tens of ng/l of Cd. The stations were confined to a bathymetry of 100m.

OriginatorsENEA Centro Ricerche Ambiente Marino - La Spezia
Data web sitehttp://www.santateresa.enea.it
Availability 
OrganisationENEA Centro Ricerche Ambiente Marino - La Spezia
AvailabilityBy negotiation
ContactBruschi A.
Address

ENEA Centro Ricerche Ambiente Marino - La Spezia
Forte S. Teresa Via S.Teresa 1
Lerici

19036
Italy

Telephone+39 0187 978215
Facsimile+39 0187 978273
Administration 
Collating centreOGS (Istituto Nazionale di Oceanografia e di Geofisica Sperimentale), Division of Oceanography
Local identifierOGS-EDMED-153
Global identifier3822
Last revised1992-09-18