Analytical intercomparison results from the 1990 Intergovernmental Oceanographic Commission open-ocean baseline survey for trace metals: Atlantic Ocean

“Dissolved” (< 0.4 μm filtered) and “total dissolvable” (unfiltered) trace element samples were collected using “clean” sampling techniques from four vertical profiles in the eastern Atlantic Ocean on the first IOC Trace Metals Baseline expedition. The analytical results obtained by 9 participating laboratories for Mn, Fe, Co, Ni, Cu, Zn, Cd, Pb, and Se on samples from station 4 in the northeast Atlantic have been evaluated with respect to accuracy and precision (intercomparability). The data variability among the reporting laboratories was expressed as 2 × SD for a given element and depth, and was comparable to the 95% confidence interval reported for the NASS seawater reference standards (representing analytical variability only). The discrepancies between reporting laboratories appear to be due to inaccuracies in standardization (analytical calibration), blank correction, and/or extraction efficiency corrections.Several of the sampling bottles used at this station were not adequately pre-cleaned (anomalous Pb results). The sample filtration process did not appear to have been a source of contamination for either dissolved or particulate trace elements. The trace metal profiles agree in general with previously reported profiles from the Atlantic Ocean. We conclude that the sampling and analytical methods we have employed for this effort, while still in need of improvement, are sufficient for obtaining accurate concentration data on most trace metals in the major water masses of the oceans, and to enable some evaluation of the biogeochemical cycling of the metals.

Christian education in China : a study made by an educational commission representing the mission boards and societies conducting work in China.

http://www.archive.org/details/christianeducati008935mbp

Re-thinking missions ; a laymen's inquiry after one hundred years, by the Commission of appraisal, William Ernest Hocking, chairman.

http://www.archive.org/details/rethinkingmissio011901mbp

Termination of tenancies for tenant default: Law Commission's draft Bill

Reviews key proposals of a draft Bill set out in Command Paper: The Law Commission: Termination of Tenancies for Tenant Default (Cm.6946), aimed at replacing the existing law on forfeiture of tenancies. Summarises the main elements of the proposed termination action by landlords, the events justifying such an action, the time limits for serving default notices, the revised range of court orders available and the considerations influencing which type of order to make. Examines the position of qualifying interest holders and the circumstances in which summary termination notices are prohibited.