5 responses |
Karen & Paul starts with ... Hi All, you may remember us from a few months ago building our new house? Well it's coming along and getting very close to completion. Hoping to put our first plant in this weekend - passionfruit vine :-) So the plasterers are there at the moment, throwing piles of off cuts out the back door. They have told us to break them up under the gardens and lawn as they will break down. Sounds weird to me, isn't this stuff like cement? Toxic? He also said something about it adding lime - we have pretty heavy clay soils. Anyone have any words of wisdom for us on this one? | About the Author Karen Paul1 Pottsville NSW 15th October 2009 3:46pm #UserID: 2561 Posts: 29 View All Karen Paul1's Edible Fruit Trees |
Dekka says... It's amazing what some people in the building trades will do to avoid tip fees. Here's some wiki info:- A wallboard panel is made of a paper liner wrapped around an inner core made primarily from gypsum plaster, the semi-hydrous form of calcium sulfate (CaSO4·½ H2O). The raw gypsum, CaSO4·2 H2O, The plaster is mixed with fiber (typically paper and/or fiberglass), plasticizer, foaming agent, finely ground gypsum crystal as an accelerator, EDTA, starch or other chelate as a retarder, various additives that increase mildew and fire resistance (fiberglass or vermiculite), wax emulsion for lower water absorption and water. This is then formed by sandwiching a core of wet gypsum between two sheets of heavy paper. EDTA is a widely used initialism for the chemical compound ethylenediaminetetraacetic acid (which has many other names, see Table). EDTA is a polyamino carboxylic acid with the formula [CH2N(CH2CO2H)2]2. This colourless, water-soluble solid is widely used to dissolve scale. Its usefulness arises because of its role as a chelating agent, i.e. its ability to "sequester" metal ions such as Ca2+ and Fe3+. After being bound by EDTA, metal ions remain in solution but exhibit diminished reactivity. EDTA is produced as several salts, notably disodium EDTA and calcium disodium EDTA. EDTA is in such widespread use that it has emerged as a persistent organic pollutant.[18] Its degradation entails conversion to ethylenediaminetriacetic acid, which then cyclizes. Alternative, more readily degradable chelating agents are being developed such as ethylenediamine-N,N'-disuccinic acid. EDTA exhibits low toxicity with LD50 (rat) of 2.0 – 2.2 g/kg.[4] It has been found to be both cytotoxic and weakly genotoxic in laboratory animals. Oral exposures have been noted to cause reproductive and developmental effects.[9] The same study by Lanigan[9] also found that both dermal exposure to EDTA in most cosmetic formulations and inhalation exposure to EDTA in aerosolized cosmetic formulations would produce systemic effects below those seen to be toxic in oral dosing studies. | About the Author Dekka Newcastle 15th October 2009 4:27pm #UserID: 102 Posts: 219 View All Dekka's Edible Fruit Trees |
|---|---|
Ellen says... Karen & Paul You tell them to clean up after themselves or else later you'll have to clean up yourelf . Our builder had cleaned up, but bits and pieces here and there all over in our back yard, the grass has came up high, we didn't see, we ended up having to hire a bin, plus with the tall grass cuts, whoa, it was such a mess . Council rubbish truck won't tip your bin for you if it is packed and too heavy especially if they know it contained builder's rubbish . | About the Author Ellen Smithfield 15th October 2009 6:32pm #UserID: 1339 Posts: 309 View All Ellen's Edible Fruit Trees |
| About the Author 15th October 2009 10:52pm #UserID: 0 Posts: View All 's Edible Fruit Trees |
|
| About the Author Karen Paul1 Pottsville NSW 16th October 2009 7:43am #UserID: 2561 Posts: 29 View All Karen Paul1's Edible Fruit Trees |
|
| About the Author Karen Paul1 Pottsville NSW 16th October 2009 7:47am #UserID: 2561 Posts: 29 View All Karen Paul1's Edible Fruit Trees |
|