Complexes of Fe(III) ions with mefenamic acid.

Mononuclear and binuclear complexes of mefenamic acid with Fe(III) ions of formulae Na[Fe(C15H14O2N)4] and Fe2Cl(C15N14O2N)5 were obtained in the solid phase. Characterization of the complexes was performed by elemental analysis and visible, IR, 1H and 13C NMR spectroscopy and possible structures are proposed.

[Fluorine and lead content in selected vegetables grown within the range of emission of compounds containing these elements by the glass plant"Irena" in Wroclaw]. / Zawartosc fluoru i olowiu w wybranych warzywach uprawianych w zasiegu emisji zwiazków tych pierwiastków przez hute szkla gospodarczego (HSG) "Irena" w inowroclawiu.

By means of spectroscopy fluorine and lead were determined in selected vegetables gathered in 1990 from Workers' Gardening Plots "Transportowiec" lying about 500 m from the Irena glass plant and similar plots "Irena" situated about 2600 m from the emitters of the plant. The obtained results were compared with those of similar measurements in the preceding 8 years, and with analogous determinations in the vegetables gathered in 1989 from "Podzamcze" gardening plots in Szczytna in immediate vicinity of the glass plant "Sudety". The study extended over many years showed that in the vicinity of such plants, the soil, the vegetables and fruit are contaminated with fluorine and lead. Moving of "Irena" gardening plots from 50-350 m from the plant to a distance of 1800 m from it caused that only the parts of the vegetables above soil level contained higher amounts of fluorine and lead. Certain above-soil parts of the plants from the "Podzamcze" gardening plots contained fluorine in amounts exceeding the acceptable level. Most vegetables, both roots and higher parts, were contaminated with lead, indicating that the soil was contaminated with lead also.

[Effect of emissions from the glass factory "Sudety" in Szczytna on the levels of lead and fluorine in selected vegetables and fruit collected in 1989]. / Wplyw emisji huty szkla "sudety" w szczytnej na zawartosc olowiu i fluoru w wybranych warzywach i owocach zebranych w 1989 roku.

The objective of these studies was to examine the lead and flurorine contents in vegetables and apples exposed to emission of these elements by the "Sudety" Glassworks in Szczytna (Walbrzych voivodeship). After mineralization of plant material, lead was determined by atomic absorption spectrometry (AAS). Fluorine was isolated from plant material samples by microdiffusion and was assayed spectrophotometrically using its complex with alizarin. The results indicate that 68% of the vegetables display lead contents exceeding the polish standard (i.e. 0.3 mg Pb per 1 kg of vegetable wet weight). Lead contents are highest in the overground parts of some plants, e.g. onion, lettuce, sorrel and rhubarb. The standard is exceeded from 23 to 13 times. So high a vegetable contamination is due to objectionable location of the "Podzamcze" employees' plots of gardens in Szczytna, related to the close vicinity of the "Sudety" Glassworks, wind rose and traffic arteries. The fluorine level in the vegetables examined is not very high. Only 4 of the analysed 21 vegetables exhibited fluorine contents exceeding those admitted by the Council for Mutual Economic Aid (2.5 mg F per 1 kg of vegetable wet weight); they included: young beet leaves, parsley tops, lettuce and sorrel.

[Effect of emissions from the Household Glassware Factory (HGF) "Irena" in Inowroclaw on the levels of fluorine and lead in selected vegetables and fruit harvested in 1988]. / Wplyw emisji Huty Szkla Gospodarczego (HSG) "Irena" w Inowroclawiu na zawartosc fluoru i olowiu w wybranych warzywach i owocach zebranych w 1988 roku.

Fluorine and lead were determined by spectroscopic methods in some vegetables harvested in 1988 in two groups of Employees' Gardens in Inowroclaw ("Transportowiec" and "Irena", distant from the Household Glassworks "Irena" by ca. 500 and 2600 m, respectively). Employees' Gardens "Irena" were divided into 2 belts, in consideration of a vicinal traffic artery. It was found that 42% of the plants harvested in Employees' Gardens "Transportowiec" exhibited excessive contents of fluorine, and 91%--of lead; fluorine contamination of vegetables was, however, slight, except for parsley leaves containing 56.0 mg F per 1 kg dry weight. In the case of Employees' Gardens "Irena", in the I belt (30-40 m from the traffic artery) the level of fluorine was excessive in 8.3% of plants, and that of lead--in 63.6% of plants; in the II belt (80-100 m from the traffic artery) the respective values were 17% for fluorine and 66.6% for lead.

Spectrophotometric investigations on protolytic equilibria of mefenamic acid and determination by means of Fe(III) in methanol-aqueous media.

Studies have been carried out on the effect of pH (from pH 11.33 to H(O) = -4.65) on the UV spectrum of mefenamic acid. The dissociation constant pKa was found to be 4.55 +/- 0.06 and the protonation constant pK(2) was -1.78 +/- 0.18 in methanol-aqueous media. Mefenamic acid was determined spectrophotometrically by formation of a coloured complex (2:5) with Fe(III). At 495 nm Beer's law was followed for the concentration range 96.52 to 579.12 mug ml(-1).